Optical transmission and laser structuring of silicon membranes (2009)
Juodkazis, Saulius, Nishi, Yasufumi, Misawa, Hiroaki, Mizeikis, Vygantas, Schecker, Olivier, Waitz, Reimar, ...
The optical linear and nonlinear properties of » 340-nm thick Si membranes were investigated. The investigation included both experiments in which the reflection and transmission from the membranes...
Femtosecond laser near field ablation (2009)
Plech, Anton, Leiderer, Paul, Boneberg, Johannes
The high field strength of femtosecond laser pulses leads to nonlinear effects during the interaction with condensed matter. One such effect is the ablation process, which can be initiated below the...
Mikuszeit, Nikolai, Baraban, Larysa, Vedmedenko, Elena Y., Erbe, Artur, Leiderer, Paul, Wiesendanger, Roland
The magnetostatic interactions of colloidal particles, capped with radially magnetized Co/Pt multilayers, are modeled. Motivated by experiment the particles are arranged in microscopic...
Femtosecond laser near field ablation (2009)
Plech, Anton, Leiderer, Paul, Boneberg, Johannes
The high field strength of femtosecond laser pulses leads to nonlinear effects during the interaction with condensed matter. One such effect is the ablation process, which can be initiated below the...
Drexler, Katja, Smirnova, Julia, Galetskaya, Marina, Voss, Sönke, Fonin, Mikhail, Boneberg, Johannes, ...
The formation of self-assembled monolayers (SAMs) on gold by 2-(5-iodo-2-nitrophenyl) propoxycarbonyl (I-NPPOC)-protected thymidine with an attached mercaptohexyl succinate linker and the kinetics of...
Imprinting the Optical Near Field of Microstructures with Nanometer Resolution (2009)
Kühler, Paul, García De Abajo, F. Javier, Solis, Javier, Mosbacher, Mario, Leiderer, Paul, Afonso, Carmen Nieves, ...
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Leufke, Philipp M., Riedel, Stephen, Lee, Min-Sang, Li, Jie, Rohrmann, Hartmut, Eimüller, Thomas, ...
We report on magnetic structuring of Co/Pd multilayer films with strong perpendicular magnetic anisotropy by single-pulse direct laser interference lithography technique. Multibeam laser interference...
and the Research Network "Functional Nanostructures", Baden-Württemberg Welcome (2008)
Jürgen Behm, Peter Bäuerle, Othmar Marti, Peter Reineker, Paul Ziemann, Johannes Boneberg, ...
Nanoscience is rapidly developing into a new field of Science with worldwide activities and still increasing funding. From an applications point of view, the attractiveness of Nanoscience is...
Colloidal Micromotors: Controlled Directed Motion (2008)
Baraban, Larysa, Kreidler, Christian, Makarov, Denys, Leiderer, Paul, Erbe, Artur
Here we demonstrate a synthetic micro-engine, based on long-range controlled movement of colloidal particles, which is induced by a local catalytic reaction. The directed motion at long timescales...
Frustration-induced magic number clusters of colloidal magnetic particles (2008)
Baraban, Larysa, Makarov, Denys, Albrecht, Manfred, Rivier, Nicolas, Leiderer, Paul, Erbe, Artur
We report the formation of stable two-dimensional clusters consisting of long-range-interacting colloidal particles with predefined magnetic moments. The symmetry and arrangement of the particles...
Influence of chopped laser light onto the electronic transport through atomic-sized contacts (2008)
Guhr, Daniel, Rettinger, Dennis, Boneberg, Johannes, Erbe, Artur, Leiderer, Paul, Scheer, Elke
This article reports on the influence of laser irradiation onto the electrical conductance of gold nanocontacts established with the mechanically controllable breakjunction technique (MCB). We...
Jumping nanodroplets : a new route towards metallic nano-particles (2008)
Boneberg, Johannes, Habenicht, Anja, Benner, Daniel, Leiderer, Paul, Trautvetter, Moritz, Pfahler, Christian, ...
The dewetting process, which appears upon laser-induced melting of flat nanostructures and leads to a jumping of the droplets off the surface, is used for deposition of nano-particles onto a second...
Infrared steam laser cleaning (2008)
Frank, Pascal, Lang, Florian, Mosbacher, Mario, Boneberg, Johannes, Leiderer, Paul
Steam Laser Cleaning with a pulsed infrared laser source is investigated. The infrared light is tuned to the absorption maximum of water (λ = 2.94 µm, 10 ns), whereas the substrates used are...
Nanomechanical control of an optical antenna (2008)
Merlein, Jörg, Kahl, Matthias, Zuschlag, Annika, Sell, Alexander, Halm, Andreas, Boneberg, Johannes, ...
Resonant optical nanoantennas hold great promise for applications in physics and chemistry. Their operation relies on their ability to concentrate light on spatial scales much smaller than the...
Möhrke, Philipp, Moore, Thomas Arthur, Kläui, Mathias, Boneberg, Johannes, Backes, Dirk, Krzyk, Stephen, ...
Details are presented of a single shot focused magneto-optic Kerr effect (MOKE) magnetometer which is used to capture the movement of single domain walls (DWs) in permalloy (Ni80 Fe20) nanowires in...
Zech, Martin, Bromberger, Hubertus, Klier, Jürgen, Leiderer, Paul, Wyatt, Adrian F. G.
Photocurrents from cesium, flowing through gaseous 3He or 4He and also through thin liquid helium films, are investigated as a function of the chemical potential of helium at T=1.33 K. At low...
Various driving mechanisms for generating motion of colloidal particles (2008)
Erbe, Artur, Zientara, Marcin, Baraban, Larysa, Kreidler, Christian, Leiderer, Paul
Driven colloidal particles exhibit a number of interesting nonequilibrium effects. In order to study these effects the driving mechanisms have to be understood in detail. In this paper we show three...
Geldhauser, Tobias, Leiderer, Paul, Boneberg, Johannes, Walheim, Stefan, Schimmel, Thomas
Single pulse laser interference lithographie is used to structure self-assembled monolayers of thiols on gold. This structuring process is investigated by attenuated total reflection measurements,...
Electron Conductivity on Helium Films (2008)
Klier, Jürgen, Doicescu, Irena, Leiderer, Paul, Shikin, Valeri
Electrons on liquid helium films form a two-dimensional (2D) array with a wide range of electron density. This system is also very interesting for applications in restricted geometry. The...
On the Correlation between Properties of Multielectron Dimples and Bubbles (2008)
Leiderer, Paul, Shikin, Valeri
Characteristics of multielectron dimples on the surface of liquid helium and those of multielectron bubbles arising in its bulk when the charged surface develops electrohydrodynamic instability are...
Arrays of Magnetic Nanoindentations with Perpendicular Anisotropy (2007)
Makarov, D., Baraban, Larysa, Leiderer, Paul, Guhr, Ildico, Boneberg, Johannes, Schift, H., ...
The authors report an approach to the fabrication of periodic magnetic patterns using spherical indentations. These troughs are shaped by an imprint technique, employing a self-assembled monolayer of...
Causes of Weak-localization of Electrons on Liquid Helium (2007)
Wakata, Annie, Leiderer, Paul, Klier, Jürgen
We have investigated the dephasing processes in a weak localization (WL) experiment of a two-dimensional electron system on liquid helium. From low-field magnetoconductivity measurements we can...
Analysis of roughness of Cs surfaces via evaluation of the autocorrelation function (2007)
Fubel, Armin, Zech, Martin, Leiderer, Paul, Klier, Jürgen, Shikin, Valerij
At low temperature prepared quench-condensed Cs surfaces are analysed on a nanometer scale via scanning tunneling microscopy. The analysis of surface roughness is presented with the help of the...
Graf, Johannes, Mosbacher, Mario, Hong, Ming Hui, Chong, Chong T., Boneberg, Johannes, ...
In this paper a new laser-based technique for the removal of nanoparticles from silicon wafers, called matrix laser cleaning, is introduced. In contrast to the already existing technique dry laser...
Characterization of magnetic colloids by means of magnetooptics (2007)
Baraban, Larysa, Erbe, Artur, Leiderer, Paul
A new, efficient method for the characterization of magnetic colloids based on the Faraday effect is proposed. According to the main principles of this technique, it is possible to detect the stray...
Taubert, Richard, Hudert, Florian, Bartels, Albrecht, Merkt, Florian, Habenicht, Anja, Leiderer, Paul, ...
We investigate the impulsively excited acoustic dynamics of nanoscale Au triangles of different sizes and thicknesses on silicon and glass substrates. We employ high-speed asynchronous optical...
Acoustic laser cleaning of silicon surfaces (2007)
Geldhaser, Tobias, Ziese, Florian, Merkt, Florian, Erbe, Artur, Boneberg, Johannes, Leiderer, Paul
We investigate the detachment of small particles from silicon surfaces by means of acoustic waves generated by laser-induced plasma formation at the back side of the sample. It is demonstrated that...
Transmission increase upon switching VO2 thin films on microstructured surfaces (2007)
Karakurt, Ismail, Boneberg, Johannes, Leiderer, Paul, Lopez, Rene, Halabica, Andrej, Haglund, Richard
The authors compare transmission measurements of near-infrared light through VO2 thin films on smooth substrates and on ordered arrays of silica microspheres. When the samples are heated above the...
Optical near-fields of triangular nanostructures (2007)
Boneberg, Johannes, König-Birk, Juliane, Münzer, Hans-Joachim, Leiderer, Paul, Shuford, Kevin L., Schatz, George C.
We compare simulations of optical near-fields of single triangular nanostructures with experimental results from a near-field ablation technique on a periodic arrangement of triangles. We find good...
Layer Reduction in Driven 2D-Colloidal Systems through Microchannels (2006)
Köppl, Michael, Henseler, Peter, Erbe, Artur, Nielaba, Peter, Leiderer, Paul
The transport behaviour of a system of gravitationally driven superparamagnetic colloidal particles is investigated. The motion of the particles through a narrow channel is governed by magnetic...
Capped colloids as light-mills in optical traps (2006)
Merkt, Florian, Erbe, Artur, Leiderer, Paul
Custom-designed colloidal particles in optical tweezers act as lightmills in a fluid. In particular, aqueous suspensions of capped silica colloids, in which half of the surface is covered with metal...
Nanoparticle adhesion and removal studied by pulsed laser irradiation (2006)
Leiderer, Paul, Olapinski, Michael, Mosbacher, Mario, Boneberg, Johannes
The contactless removal of small particles from surfaces by irradiation with intense laser pulses dubbed laser cleaning has been used and studied for nearly two decades. Nevertheless, its...
Electrochromic switching of WO3 nanostructures and thin films (2006)
Karakurt, Ismail, Boneberg, Johannes, Leiderer, Paul
We present transmission measurements through tungsten tri-oxide nanostructures and thin films prepared by solgel process on micro-contact printed substrates. Identical electrochromic switching...
The phase-transition dynamics of isopropanol (C3H8O) films with thicknesses on the order of 100 nm deposited on silicon wafers are investigated. A Nd :YAG nanosecond laser pulse is used to heat the...
Schuppler, Christian, Habenicht, Anja, Guhr, Ildico, Maret, M., Leiderer, Paul, Boneberg, Johannes, ...
We report an approach to altering the magnetic properties of (111) textured Co/Pt multilayer films grown on sapphire (0001) substrates in a controlled way using single-pulse laser irradiation. The...
Size-Dependent Self-Organization of Colloidal Particles on Chemically Patterned Surfaces (2006)
Karakurt, Ismail, Leiderer, Paul, Boneberg, Johannes
A study of the self-organization of colloidal particles during the evaporation of particle solutions on chemically patterned surfaces is presented. On a surface with hydrophilic and hydrophobic...
Hydrogen Adsorption Isotherms : Modelling of Experimental Data (2005)
Tibus, Stefan, Klier, Jürgen, Leiderer, Paul
Adsorption isotherm measurements have shown deviations from classical theories in the past, leading to the inclusion of more complex effects into adsorption theory. We demonstrate here that in the...
Equilibrium helium films under the influence of surface roughness (2005)
Klier, Jürgen, Zech, Martin, Fubel, Armin, Leiderer, Paul, Shikin, Valeri
Equilibrium helium flms adsorbed on solid substrates are investigated. Due to their thickness these flms are mainly in the retardation regime where the influence of the roughness of the substrates,...
Habenicht, Anja, Olapinski, Michael, Burmeister, Frank, Leiderer, Paul, Boneberg, Johannes
Flat gold nanostructures on inert substrates like glass or graphite were illuminated by single intensive laser pulses with fluences above the gold melting threshold. The liquid structures produced in...
Wetting behavior of liquid 4He on rough Cs films : pinning, memory effect, and micropuddles (2005)
Klier, Jürgen, Leiderer, Paul, Reinelt, Dietmar, Wyatt, Adrian F. G.
The liquid 4He-cesium system is a nearly ideal one for studying wetting phenomena. However, it can show nonideal behavior such as an extreme wetting hysteresis and a memory of being in contact with...
Velocity measurements of the dendritic instability in YNi2B2C (2005)
Biehler, Björn, Runge, Bernd-Uwe, Wimbush, Stuart C., Holzapfel, Bernhard, Leiderer, Paul
We measured the velocity of the flux front of an artificially nucleated dendritic instability in YNi2B2C. The required time resolution In the nanosecond regime was achieved by our magneto-optic...
Liquid 4He on Cs : drying, depinning, and the non-wetting thin-film (2005)
Reinelt, Dietmar, Iov, Valentin, Leiderer, Paul, Klier, Jürgen
Liquid 4He shows a dewetting phase on Cs and Rb at low temperatures. These are the only substrates which are not wetted by 4He. On Cs the wetting temperature, Tw, is about 2 K. Usually one observes a...
Triple-point wetting of molecular hydrogen isotopes (2005)
Sohaili, Masoud, Klier, Jürgen, Leiderer, Paul
Triple-point wetting is a well-known phenomenon of simple adsorbates on solid substrates, which involves, in the liquid phase above the triple-point temperature, T3, complete wetting with the...
Observation of a New Mechanism of Spontaneous Generation of Magnetic Flux in a Superconductor (2005)
Maniv, Ariel, Polturak, Emil, Koren, Gad, Bliokh, Yuri, Biehler, Björn, Runge, Bernd-Uwe, ...
We report the discovery of a new mechanism of spontaneous generation of a magnetic flux in a superconductor cooled through Tc. Values of the spontaneous flux appear random from one cooldown to the...
On ultrafast magnetic flux dendrite propagation into thin superconducting films (2005)
Biehler, Björn, Runge, Bernd-Uwe, Leiderer, Paul, Mints, Roman G.
We suggest a theoretical model allowing to find analytically the velocity of a magnetic flux dendrite penetration into thin superconducting films. The key assumptions for this model are based upon...
Temperature Dependence of Hydrogen Adsorption Isotherms (2005)
Tibus, Stefan, Klier, Jürgen, Leiderer, Paul
In the past it has already been shown that adsorption isotherms of liquid or solid films are not described completely by the Frenkel-Halsey-Hill theory. Substrate roughness as well as thermal...
Magnetic multilayers on nanospheres (2005)
Albrecht, Manfred, Hu, Guohan, Guhr, Ildico L., Ulbrich, Till C., Boneberg, Johannes, Leiderer, Paul, ...
Thin-film technology is widely implemented in numerous applications. Although flat substrates are commonly used, we report on the advantages of using curved surfaces as a substrate. The curvature...
Laser cleaning of particles from silicon wafers : capabilities and mechanisms (2005)
Graf, Johannes, Lang, Florian, Mosbacher, Mario, Leiderer, Paul
The preparation of surfaces free of particle contamination is one of the crucial prerequisites for a further increase in the integration density of ICs and for the progress in nanotechnology....
Electrons above helium films on metal substrates (2004)
Angrik, Jörg, Faustein, Andreas, Klier, Jürgen, Leiderer, Paul
We report about our investigations on two-dimensional electron ensembles floating above thin helium films supported by metallic substrates. We found a surprisingly high stability of these electrons,...
Imaging optical near-fields of nanostructures (2004)
Leiderer, Paul, Bartels, Christof, Koenig-Birk, Juliane, Mosbacher, Mario, Boneberg, Johannes
We present a method for imaging the optical near-fields of nanostructures, which is based on the local ablation of a smooth silicon substrate by means of a single, femtosecond laser pulse. At those...
Characterization of Quench-Condensed Cesium an a Nanometer Scale at Low Temperatures (2004)
Zech, Martin, Fubel, Armin, Leiderer, Paul, Klier, Jürgen
The alkali metals Cs and Rb are the only surfaces which are not wetted by liquid 4He below a certain temperature. Especially for the system 4He-Cs this has been observed many times. However, there...
Magneto-optic Investigation of Magnetic Flux Penetration on a Nanosecond Timescale (2004)
Biehler, Björn, Bolz, Uwe, Runge, Bernd-Uwe, Leiderer, Paul
We have studied the dynamics of iron-garnet films using a pump-probe technique and were able to demonstrate that the response time of such a film is sufficiently short to investigate sub-nanosecond...
Islands of (In-)stability in High Temperature Superconductors (2004)
Biehler, Björn, Runge, Bernd-Uwe, Leiderer, Paul
Dendritic flux penetration is a well known phenomenon in high temperature superconductors. We investigated the conditions under which this instability can be observed in different materials. We found...
Lang, Florian, Leiderer, Paul, Georgiou, Savas
The ejection dynamics of nanometer-thick liquid (isopropanol) films from a substrate caused by a phase transition in a superheated layer at the interface are studied. A nanosecond laser pulse is used...
Diffusion of colloids in one-dimensional light channels (2004)
Lutz, Christoph, Kollmann, Markus, Leiderer, Paul, Bechinger, Clemens
Single-file diffusion (SFD), prevalent in many chemical and biological processes, refers to the one-dimensionalmotion of interacting particles in pores which are so narrow that the mutual passage of...
Binary colloidal systems in two-dimensional circular cavities : structure and dynamicsy (2004)
Mangold, Konrad, Birk, Juliane, Bechinger, Clemens, Leiderer, Paul
We study the melting behavior of a binary system (R = 4.5 mm, r = 2.8 mm) of paramagnetic colloidal spheres in two-dimensional (2D) circular cavities. A repulsive interaction between the particles is...
Influence of the concentration of Hz-D2 mixtures on their triple-point dewetting behavior (2003)
Tibus, Stefan, Sohaili, Masoud, Klier, Jürgen, Leiderer, Paul
Triple-point dewetting of pure gases llke hydrogen aird deuterium on solid substrates is a well-known phenomenon. This property persists even for the mixed system of Hz and D2. There exists an...
Equilibrium helium film in the thick film limit (2003)
Klier, Jürgen, Schletterer, Frank, Leiderer, Paul, Shikin, Valeri
For the thickness of a liquid or solid quantum film, like liquid helium or solid hydrogen, there exist still open questions about how the film thickness develops in certain limits. One of these is...
Subpattern formation during condensation processes on structured substrates (2003)
Schäfle, Claudia, Leiderer, Paul, Bechinger, Clemens
We investigate the temporal and spatial development of condensation patterns on chemically patterned substrates. We find that droplets condense preferentially on lyophilic sites and are surrounded by...
Dynamics of the dendritic flux instability in YBa2Cu3O7-delta films (2003)
Bolz, Uwe, Biehler, Björn, Schmidt, Daniel, Runge, Bernd-Uwe, Leiderer, Paul
We have studied the dynamics of magnetic-flux avalanches in superconducting YBa2Cu3O7-δ films by means of a fast magneto-optic pump-probe technique. Two regimes of propagation are found: in...
Cyclotron resonance for 2D electrons on helium films above rough substrates (2003)
Würl, Andreas, Klier, Jürgen, Leiderer, Paul, Shikin, Valeri
An investigation of the microwave absorption for two-dimennonal electron systems (2DES) on helium films and in the presence of a cyclotron resonance (CR) inagietic field are presented. Measured data...
Dendritic and homogeneous regimes of flux penetration into YBCO films (2003)
Bolz, Uwe, Schmidt, Daniel, Biehler, Björn, Runge, Bernd-Uwe, Mints, Roman G., Numssen, Kai, ...
Dendritic flux patterns in superconducting YBCO films are studied on a nanosecond time-scale. It is found that dendrites only develop for certain values of the external field and temperature.
Phase transitions of colloidal monolayers in periodic pinning arrays (2003)
Mangold, Konrad, Leiderer, Paul, Bechinger, Clemens
We study the phase behavior of two-dimensional paramagnetic colloidal systems on square pinning arrays, the latter being created by a holographic optical tweezer technique. When the particle...
The effect of roughness on the T3-dewetting of molecular hydrogen (2003)
Angrik, Jörg, Sohaili, Masoud, Klier, Jürgen, Leiderer, Paul
Triple-point dewetting is a well-known behaviour of molecular hydrogen and other van der Waals systems like noble gases on a solid substrate. Recent theoretical and experimental investigations (Phys....
The growth of the non-wetting liquid 4He on Cs (2003)
Iov, Valentin, Klier, Jürgen, Leiderer, Paul
It was theoretically predicted that the heavy alkali metals provide the only surfaces non-wetted by superfluid 4He below a certain temperature Tw. This was experimentally proven both for Cs and for...
Influence of storage time on laser cleaning of SiO2 on Si (2003)
Schrems, Gernot, Delamare, Marie-Pierre, Arnold, Nikita, Leiderer, Paul, Bäuerle, Dieter
The influence of the 'storage time' Fs on the threshold fluence Jcl and the efficiency in dry laser cleaning is investigated. Fs denotes the time between the deposition of particles and the cleaning....
Direct measurement of entropic forces induced by rigid rods (2003)
Helden, Laurent, Roth, Roland, Koenderink, Gijsje H., Leiderer, Paul, Bechinger, Clemens
We present the first direct depletion potential measurements for a single colloidal sphere close to a wall in a suspension of rigid colloidal rods. Since all particle interactions are as good as...
Lang, Florian, Mosbacher, Mario, Leiderer, Paul
The removal of particles from commercial silicon wafers by Steam Laser Cleaning was examined. Polystyrene colloids were used as model contaminants due to their well defined size and shape. In...
Chaoui, Nouari, Solis, J., Afonso, Carmen Nieves, Fourrier, T., Muehlberger, T., Schrems, Gernot, ...
A differential optical transmission technique has been used to monitor in situ the efficiency of laser cleaning for the removal of sub-micrometer-sized particles on substrates transparent at the...
Laser cleaning of silicon wafers : prospects and problems (2003)
Mosbacher, Mario, Dobler, Volker, Bertsch, Micha, Münzer, Hans-Joachim, Boneberg, Johannes, Leiderer, Paul
The removal of particle contamination from surfaces is one of the crucial prerequisites for a further increase in the integration density of ICs and for the progress in nanotechnology. At all stages...
Surface excitations in thin helium films on silica aerogel (2002)
Lauter, Hans J., Bogoyavlenskii, I. V., Puchkov, Alexander. V., Godfrin, Henri, Skomorokhov, Andrei, Klier, Jürgen, ...
First measurements are reported on pure surface excitations in thin superfluid 4He films on silica aerogel. The ripplon dispersion curve is found to be the same for helium on graphite and silica...
Fluctuation-induced order in two-dimensional colloidal clusters (2002)
Bubeck, Ralf, Leiderer, Paul, Bechinger, Clemens
The behaviour of a finite number (N = 29) of paramagnetic colloidal particles in 2D circular hard-wall cavities is investigated. By applying a magnetic field B, the interaction between the particles...
Cyclotron resonance for two-dimensional electrons on thin helium films (2002)
Klier, Jürgen, Würl, Andreas, Leiderer, Paul, Mistura, Giampaolo, Shikin, Valeri
We present a systematic investigation of the microwave absorption for two-dimensional electron layers on thin helium films and in the presence of a cyclotron resonance (CR) magnetic field. To explain...
Triple-point wetting on rough substrates (2002)
Esztermann, Ansgar, Heni, Martin, Löwen, Hartmut, Klier, Jürgen, Sohaili, Masoud, Leiderer, Paul
The influence of substrate roughness on the wetting scenario of adsorbed van der Waals films is investigated by theory and experiment. Calculating the bending free energy penalty of a solid sheet...
Electrons on liquid helium in a resonator (2002)
Würl, Andreas, Klier, Jürgen, Leiderer, Paul, Shikin, Valeri
An investigation of the microwave absorption for 2-dimensional electron layers in a resonator cavity are presented. The difference in the eigenmodels of the resonator in case of an empty cavity and...
Adsorpation of thin liquid helium films on Cs measured via photoelectron tunneling (2002)
Iov, Valentin, Klier, Jürgen, Leiderer, Paul
The alkali metals Cs and Rb are the only surfaces which are not wetted by superfluid 4He below a certain temperature. In our experiments, using the photoelectron tunneling method, we can highly...
Dynamic particle removal by nanosecond dry laser cleaning : theory (2002)
Arnold, Nikita, Schrems, Gernot, Mühlberger, T., Bertsch, Micha, Mosbacher, Mario, Leiderer, Paul, ...
A model for ns dry laser cleaning that treats the substrate and particle expansion on a unified basis is suggested. Formulas for the time-dependent thermal of the substrate, valid for...
Optical near field effects in surface nanostructuring and laser cleaning (2002)
Münzer, Hans-Joachim, Mosbacher, Mario, Bertsch, Micha, Dubbers, Oliver, Burmeister, Frank, Pack, Andreas, ...
We present a method for directly imaging the undisturbed near field of a particle resting on a surface. A comparison with numerical computations shows good agreement with the results of our...
Laser cleaning of silicon wafers : mechanisms and efficiencies (2002)
Mosbacher, Mario, Bertsch, Micha, Münzer, Hans-Joachim, Dobler, Volker, Runge, Bernd-Uwe, Bäuerle, Dieter, ...
Laser Cleaning (SLC) process. Using a frequency doubled, Q-switched Nd:YAG laser (FWHM=8 ns) we removed polystyrene (PS) particles with diameters from 110-2000 nm from industrial silicon wafers by...
Leiderer, Paul, Mosbacher, Mario, Dobler, Volker, Schilling, Andreas, Yavas, Oguz, ...
The removal of dust particles from semiconductor surfaces requires new cleaning strategies such as Steam Laser Cleaning (SLC). It is based on laser-induced explosive evaporation of a liquid layer...
Optical resonance and near-field effects in dry laser cleaning (2002)
Mosbacher, Mario, Zheng, Y. W., Münzer, Hans-Joachim, Huang, S. M., Bertsch, Micha, ...
Optical problems, related to the particle on the surface, i.e. optical resonance and near-field effects in laser cleaning are discussed. It is shown that the small transparent particle with size by...
Superhard, conductive coatings for atomic force microscopy cantilevers (2001)
Ronning, Carsten, Wondratschek, Oliver, Büttner, Michael, Hofsäss, Hans Christian, Zimmermann, J., Leiderer, Paul, ...
Boron carbide thin films were grown by mass selected ion beam deposition using low energy 11B+ and 12C+ ions at room temperature. The amorphous films exhibit any desired stoichiometry controlled by...
Pasquet, Pierre, Psyllaki, Pandora, Oltra, Roland, Boquillon, Jean-Pierre, Leiderer, Paul, Boneberg, Johannes, ...
In the present work, the effects of nanosecond pulsed laser irradiation on oxidised metallic surfaces were investigated, in order to estimate the possibility of using laser techniques for cleaning...
Eisenmenger, Johannes, Leiderer, Paul, Wallenhorst, Michael, Dötsch, Horst
The magnetic flux penetration into thin type-II superconducting films with circular defects is investigated. The artificial circular defects (diameter = 40 μm) in an YBa2Cu3O72d thin film...
Deposition of mass-selected cluster ions using a pulsed arc cluster-ion source (2001)
Klipp, Björn, Grass, Martin, Müller, Jürgen, Stolcic, Davor, Lutz, Ulrich, Ganteför, Gerd, ...
A PACIS (pulsed arc cluster-ion source) developed for high average cluster-ion currents is presented. The performance of the PACIS at different operational modes is described, and the suitability for...
Dip problem of the electron mobility on a thin helium film (2001)
Shikin, Valeri, Klier, Jürgen, Doicescu, Irena, Würl, Andreas, Leiderer, Paul
Electrons floating above liquid helium form an ideal two-dimensional system with an extremely high mobility. However, the mobility can change substantially when decreasing the thickness of the helium...
Grünberg, Hans-Hennig Von, Helden, Laurent, Leiderer, Paul, Bechinger, Clemens
Due to double-layer forces a charged colloid suspended in an electrolyte is repelled from a like-charged planar wall. We demonstrate that and how a precise measurement of these double-layer forces...
Phase Behavior of Two-Dimensional Colloidal Systems in the Presence of Periodic Light Fields (2001)
Bechinger, Clemens, Brunner, Matthias, Leiderer, Paul
We investigate the phase behavior of a two-dimensional suspension of charge stabilized polystyrene spheres in the presence of a one-dimensional periodic light field. With increasing light intensity...
Two-Fraction Electron System on a Thin Helium Film (2001)
Klier, Jürgen, Günzler, Tobias, Würl, Andreas, Leiderer, Paul, Mistura, Giampaolo, Teske, Ekkehard, ...
A systematic theoretical investigation of microwave absorption of 2-dimensional electron systems above a thin helium film in the presence of a cyclotron resonance magnetic field is presented. To...
Substrate-induced phase transitions in two-dimensional colloidal systems (2001)
Mangold, Konrad, Bubeck, Ralf, Leiderer, Paul, Bechinger, Clemens
We study the phase behaviour of a 2D colloidal system in the presence of a an external periodic 1D potential. As colloidal suspension we use an aqueous suspension of superparamagnetic spheres with a...
Structure and dynamics of two-dimensional colloidal systems in circular cavities (2001)
Bubeck, Ralf, Leiderer, Paul, Bechinger, Clemens
The properties of 2D colloidal crystals have been widely investigated over the last 20 years. Recently, it has been recognized that colloids are also useful for the investigation of systems comprised...
Triple-Point Wetting of Molecular Hydrogen on Tailored Substrates (2001)
Sohaili, Masoud, Klier, Jürgen, Leiderer, Paul
Triple-point wetting is a well-known phenomenon of many simple adsorbates on solid substrates. It implies that in the liquid phase above the triple-point temperature, T3, complete wetting with the...
Local field enhancement effects for nanostructuring of surfaces (2001)
Münzer, Hans-Joachim, Mosbacher, Mario, Bertsch, Micha, Zimmermann, J., Leiderer, Paul, Boneberg, Johannes
We report on a method that allows the nanostructuring of surfaces with intense laser pulses. For this purpose isolated polystyrene spheres with diameters in the order of the laser wavelength were...
Optical field enhancement effects in laser-assisted particle removal (2001)
Mosbacher, Mario, Münzer, Hans-Joachim, Zimmermann, Jörg, Solis Cespedes, Francisco Javier, Boneberg, Johannes, Leiderer, Paul
We report on the role of local optical field enhancement in the neighbourhood of particles during dry laser cleaning (DLC) of silicon wafer surfaces. Samples covered with spherical colloidal...
Laser cleaning of polymer surfaces (2001)
Fourrier, T., Schrems, Gernot, Mühlberger, T., Heitz, J., Arnold, Nikita, Bäuerle, Dieter, ...
We have investigated the removal of small spherical particles from polymer surfaces by means of 193-nm ArF and 248-nm KrF laser light. Polystyrene (PS) particles with diameters in the range of 110 nm...
Laser assisted particle removal from Silicon wafers (2001)
Mosbacher, Mario, Münzer, Hans-Joachim, Bertsch, Micha, Dobler, Volker, Chaoui, Nouari, Siegel, Jan Philip, ...
We have studied the removal of submicrometer particles from silicon wafers by the steam laser cleaning (SLC) and dry laser cleaning (DLC) processes. These processes are currently being investigated...
Lauter-Pasyuk, Valeria, Lauter, Hans J., Lorenz, Michael, Petrenko, A., Nikonov, Oleg, Aksenov, Viktor L., ...
The magnetic field distribution inside thln YBa2Cu3O7, films in the mixed state was studied by polarized neutron reflection. The external field was parallel to the film surface, the thickness of the...
Laser-induced Particle Removal from Silicon Wafers (2000)
Leiderer, Paul, Boneberg, Johannes, Dobler, Volker, Mosbacher, Mario, Münzer, Hans-Joachim, Chaoui, Nouari, ...
The cleaning of silicon surfaces from submicron dust particles has been studied by means of the Steam Laser Cleaning (SLC) process and compared to Dry Laser Cleaning (DLC) which is used...
Chemical reaction between hydrogen atoms and electrons on the surface of superfluid 4He (2000)
Arai, T., Würl, Andreas, Leiderer, Paul, Shiino, T., Kono, Kimitoshi
Two-dimensional mixture of atomic hydrogen and electrons on the surface of superfluid 4He was realized below 0.5 K. Vibrating capacitor electrometer was employed to show that after the electron...
First dc measurements of electrons on liquid helium : the Helium-FET (2000)
Klier, Jürgen, Doicescu, Irena, Leiderer, Paul
We present the first dc-measurements on a 2-dimensional (2D) electron system floating above a liquid 4He-film which covers a structured metal surface. With our arrangement of a source-, gate-, and...
Burmeister, Frank, Boneberg, Johannes, Leiderer, Paul
Nanostrukturen sind zurzeit in aller Munde, da man von ihnen neuartige physikalische und chemische Eigenschaften erwartet. Zur Erzeugung solcher Strukturen mit GroBen von wenigen hundert Nanometern...
Wetting behaviour of solid and liquid hydrogen films (2000)
Klier, Jürgen, Weichhard, Christian, Leiderer, Paul
Adsorbates on strong bindlng substrates like H2 on Au show triple-point dewetting. To study this phenomenon in detail, we have reduced the van der Waals interaction of the H2 films with the Au...
Fleischmann, L., Bonn, Jochen, Bornschein, Beate, Leiderer, Paul, Otten, Ernst-Wilhelm, Przyrembel, Michael, ...
The dewetting dynamics of solid films of hydrogen isotopes, quench-condensed on a graphite substrate, was measured at various temperatures below desorption by observing the stray light from the film....
The effect of electron pressure on suspended helium films (2000)
Valkering, Annemarie, Klier, Jürgen, Leiderer, Paul
(Quasi) one- and zero-dimensional electron systems can be created using a suspended helium film on a structured substrate. To investigate the relation between the curved surface and the properties of...
Runge, Bernd-Uwe, Bolz, Uwe, Boneberg, Johannes, Bujok, V., Brüll, Peter, Eisenmenger, Johannes, ...
Optical methods offer an intrinsic high potential for experiments with excellent spatial and in particular also temporal resolution. Using the Faraday effect we carried out magneto-optical...
Single-file diffusion of colloids in one-dimensional channels (2000)
Wei, Qi-Huo, Bechinger, Clemens, Leiderer, Paul
Single-file diffusion, prevalent in many processes, refers to the restricted motion of interacting particles in narrow micropores with the mutual passage excluded. A single-filing system was...
Direct observation of the dynamics of electronic excitations in molecules and small clusters (2000)
Minemoto, Shinichirou, Müller, Jürgen, Ganteför, Gerd, Münzer, Hans-Joachim, Boneberg, Johannes, Leiderer, Paul
Femtosecond time-resolved photoelectron spectroscopy is applied to study relaxation paths of excited states of mass-selected negatively charged clusters. As a first example, the lifetime of an...
Ultrafast Magneto-Optical Study of Flux Avalanches in High-Tc Superconductors (2000)
Runge, Bernd-Uwe, Bolz, Uwe, Eisenmenger, Johannes, Leiderer, Paul
An ultrafast magneto-optic pump-probe technique has been used to trigger and image a flux instability in high-temperature superconducting thin films. Snapshots of the dendritic flux avalanche...
Mosbacher, Mario, Dobler, Volker, Boneberg, Johannes, Leiderer, Paul
The efficiency of the steam laser cleaning process is examined. For the investigation of the physics of particle removal from the particularly interesting surface of silicon we have deposited...
Structural stability of solid deuterium films (2000)
Fleischmann, L., Bonn, Jochen, Degen, Beate, Przyrembel, Michael, Otten, Ernst-Wilhelm, Weinheimer, Christian, ...
The wetting behavior of quenched-condensed solid D2 films has been investigated by means of light scattering. On the substrates used here (graphite and aluminum) molecular deuterium displays triple...
Submicron metal oxide structures by a sol-gel process on patterned substrates (2000)
Bechinger, Clemens, Muffler, Hans, Schäfle, Claudia, Sundberg, Olle, Leiderer, Paul
We report about a combination of micro-contact-printing and the sol-gel technique which results in structures in the micron- and submicron range. This technique which is here demostrated on...
Boneberg, Johannes, Bischof, Jörg, Leiderer, Paul
Thin metal films (Cu, Au, Ni) on quartz glass were illuminated with nanosecond pulses of a frequency doubled Nd:YAG laser (λ = 532 nm). The transient reflectivity behaviour was probed at the...
Magnetic instability in YBa2Cu307-delta films (2000)
Bolz, Uwe, Eisenmenger, Johannes, Schiessling, Joachim, Runge, Bernd-Uwe, Leiderer, Paul
Using a magneto-optic technique we have investigated the magnetic flux propagation into and out of superconducting thin YBa2Cu3O7-b films. After field cooling below Tc, the external magnetic field...
Modelling and diagnostic of pulsed laser-solid interactions : applications to laser cleaning (2000)
Oltra, Roland, Arenholz, Enno, Leiderer, Paul, Kautek, Wolfgang, Fotakis, Costas, Autric, Michel, ...
The present study concerns the cleaning of materials using pulsed laser irradiation and it summarises the most recent results obtained by the collaborative research of different European groups,...
Reentrant melting of two-dimensional colloidal systems (2000)
Bechinger, Clemens, Wei, Q. H., Leiderer, Paul
When a two-dimensional colloidal suspension of highly charged particles is subjected to a periodic one-dimensional (1D) light field, a liquidsolid transition can be induced. This phase transition...
Magnetic flux distribution inside an YBa2Cu3O7-d superconducting thin film in the mixed state (1999)
Lauter-Pasyuk, Valeria, Lauter, Hans J., Lorenz, Michael, Aksenov, Viktor L., Leiderer, Paul
The study with polarized neutron reflection showed the spatially resolved nuclear and magnetic structure in a high-temperature superconducting (HT)film of YBa2Cu307-d in the mixed state in an...
Investigations of the Vortex Matter in Bi2Sr2Ca1Cu2O8+[Delta] Single Crystals (1999)
Blasius, Thomas, Niedermayer, Christof, Schiessling, Joachim, Bolz, Uwe, Eisenmenger, Johannes, Runge, Bernd-Uwe, ...
We report transverse-field muon spin rotation studies of the magnetic field distribution n(B) in the vortex state of the high temperature superconductor Bi2Sr2Ca1Cu2O8+b (Bi-2212) and present data on...
Large area magneto-optical investigations of YBCO thin films (1999)
Kuhn, Marcus, Schey, Bernd, Biegel, Wolfgang, Stritzker, Bernd, Eisenmenger, Johannes, Leiderer, Paul
A new apparatus for magneto-optical investigations of high temperature superconducting (HTS) films as large as 20x20 cm2 is presented. With this equipment flux penetration of an external magnetic...
Sommerhalter, Christof, Matthes, Thomas W., Boneberg, Johannes, Lux-Steiner, Martha Christina, Leiderer, Paul
Current imaging tunneling spectroscopy (CITS) and photo-assisted scanning tunneling spectroscopy (STS) is used to characterize dopants in p-type WS, single crystals. While the local charge...
Understanding Depletion Forces beyond Entropy (1999)
Bechinger, Clemens, Rudhardt, Daniel, Leiderer, Paul, Roth, Roland, Dietrich, Siegfried
The effective interaction energy of a colloidal sphere in a suspension containing small amounts of nonionic polymers and a flat glass surface has been measured and calculated using total internal...
Entropische Kräfte : warum sich repulsiv wechselwirkende Teilchen anziehen können (1999)
Bechinger, Clemens, Grünberg, Hans-Hennig Von, Leiderer, Paul
Entropie, eine anschaulich schwer faßbare Größe, kann in Vielteilchensystemen zu direkt beobachtbaren Kräften führen. Taucht man zwei große harte Kugeln in ein Bad aus kleinen harten Kugeln, so...
Reversible laser annealing and magneto-optical characterization of HTSC thin films (1999)
Eisenmenger, Johannes, Zimmermann, Jörg, Schiessling, Joachim, Bolz, Uwe, Runge, Bernd-Uwe, Leiderer, Paul
The oxygen content in YBCO thin films can be changed locally by scanning a focused laser beam across the film surface at defined oxygen partial pressure. In contrast to annealing experiments in a...
Repulsive depletion interactions in colloidpolymer mixtures (1999)
Rudhardt, Daniel, Bechinger, Clemens, Leiderer, Paul
Depletion forces in colloidal systems are known to be entirely attractive, as long as the background of macromolecules is small enough that an ideal gas approach is valid. At higher densities,...
Cooperative Evaporation in Ordered Arrays of Volatile Droplets (1999)
Schäfle, Claudia, Bechinger, Clemens, Rinn, Bernd, David, C., Leiderer, Paul
We study the evaporation behaviour of regular arrays of volatile droplets on a solid substrate. We observe that under certain conditions the droplets do not evaporate independently of each other but...
Two-dimensional pressure measurements with nanosecond time resolution (1999)
Boneberg, Johannes, Briaudeau, S., Demirplak, Zeliha, Dobler, Volker, Leiderer, Paul
An optical setup for the measurement of acoustic shock waves is demonstrated experimentally. This sensor, which is based on surface plasmon excitation, provides ns time resolution as well as mm...
Optical measurements of invasive forces exerted by appressoria of a plant pathogenic fungus (1999)
Bechinger, Clemens, Giebel, Karl-Friedrich, Schnell, Martin, Leiderer, Paul, Deising, Holger B., Bastmeyer, Martin
Many plant pathogenic fungi, such as the cereal pathogen Colletotrichum graminicola, differentiate highly specialized infection structures called appressoria, which send a penetration peg into the...
Defect visualization in large area YBCO thin films by magneto-optical scanning technique (1999)
Kuhn, Marcus, Schey, Bernd, Biegel, Wolfgang, Stritzker, Bernd, Eisenmenger, Johannes, Leiderer, Paul, ...
Flux penetration in large area YBCO thin films has heen studied by a magneto-optical scanning technique. With a new apparatus HTS films as large as 20 cm x 20 cm can be investigated by scanning the...
Surface acceleration during dry laser cleaning of silicon (1999)
Dobler, Volker, Oltra, Roland, Boquillon, Jean-Pierre, Mosbacher, Mario, Boneberg, Johannes, Leiderer, Paul
We report on measurements of the surface acceleration for the application of dry laser cleaning. For that purpose, industrial silicon samples were irradiated by a frequency-doubled Q-switched Nd:YAG...
A comparison of ns and ps steam laser cleaning of Si surfaces (1999)
Mosbacher, Mario, Chaoui, Nouari, Siegel, Jan Philip, Dobler, Volker, Solis Cespedes, Francisco Javier, Boneberg, Johannes, ...
We report a quantitative investigation on the efficiency of the steam laser cleaning process using ns and ps pulses. Well-characterized polymer particles with a diameter of 800 nm dispersed on...
Experimental observation of single-file diffusion of Brownian particles (1999)
Wei, Qi-Huo, Bechinger, Clemens, Leiderer, Paul
The self-diffusion of particles restricted to one-dimensional channels is termed single-file diffusion if individual particles are unable to pass each other. We employ the interference pattern of two...
Entropic interactions in mixtures of colloids and non-ionic polymers (1999)
Rudhardt, Daniel, Bechinger, Clemens, Leiderer, Paul
In binary colloidal mixtures, depletion forces or purely entropic origin play an important role besides interaction like Coulomb or van der Waals interactions. We have measured the potential energy...
Eisenmenger, Johannes, Schiessling, Joachim, Bolz, Uwe, Runge, Bernd-Uwe, Leiderer, Paul, Lorenz, Michael, ...
Double-sided 3" HTSC Wafers were characterized by the magneto-optic technique. The presented apparatus allows a nondestructive and fast detection of local and extended inhomogeneities in the critical...
Imaging of cell/substrate contacts of living cells with surface plasmon resonance microscopy (1999)
Giebel, Karl-Friedrich, Bechinger, Clemens, Herminghaus, Stephan, Riedel, M., Leiderer, Paul, Weiland, Ulrich, ...
We have developed a new method for observing cell/substrate contacts of living cells in culture based on the optical excitation of surface plasmons. Surface plasmons are quanta of an electromagnetic...
Melting and Reentrant Freezing of Two-Dimensional Colloidal Crystals in Confined Geometry (1999)
Bubeck, Ralf, Bechinger, Clemens, Neser, Stephan, Leiderer, Paul
We study the melting behavior of a finite number (N
Ochmann, Michael, Münzer, Hans-Joachim, Boneberg, Johannes, Leiderer, Paul
We demonstrate a new circuit design for fast measurements of the voltage drop across the gap of a scanning tunneling microscope (STM) based on the simultaneous operation of two different amplifiers....
Pasquet, Pierre, Coso, Raul Del, Boneberg, Johannes, Leiderer, Paul, Oltra, Roland, Boquillon, Jean-Pierre
Laser cleaning experiments exhibited a higher cleaning efficiency of the laser cleaning upon application of electrochemical potential on an oxidised iron surface. The objective of this study is to...
Colloid monolayer lithography : a flexible approach for nanostructuring of surfaces (1999)
Burmeister, Frank, Badowsky, Wilfried, Braun, T., Wieprich, Silvana, Boneberg, Johannes, Leiderer, Paul
In this paper, we report on an alternative nanofabrication method which relies on self-assembly of colloidal particles into a two-dimensional array on surfaces. Some important parameters for...
Lauter-Pasyuk, Valeria, Lauter, Hans J., Aksenov, Viktor L., Kornilov, E. I., Petrenko, A. V., Leiderer, Paul
Polarized neutron reflectometry was used for the direct measurement of the magnetic-field penetration depth in a high-temperature (HT) superconducting film. Two scattering geometries were used. The...
Eisenmenger, Johannes, Schiessling, Joachim, Bolz, Uwe, Runge, Bernd-Uwe, Leiderer, Paul, Lorenz, Michael, ...
Doppelsei tige 3-Zoll-HTSL-Wafer wurden magnetooptisch charakterisiert. Der vorgestellte Aufbau erlaubt einen schnellen und zerstorungsfreien Nachweis von lokalen und ausgedehnten Inhornogenitiiten...
Wetting studies of liquid 4He on various Cs surfaces (1998)
Reinelt, Dietmar, Klier, Jürgen, Leiderer, Paul
Cesium is a surface not wetted by liquid 4He below a certain temperature, Tw=2K. However, one observes that a thick helium film remains on the Cs substrate even if the surface is cooled below Tw from...
Imaging of a suspended helium film with 2-D electrons by interferometry (1998)
Valkering, Annemarie, Klier, Jürgen, Teske, Ekkehard, Van Der Heijden, R. W., Leiderer, Paul
A helium film suspended between elevations on a substrate forms an excellent surface for a two-dimensional electron gas. With the structure on the substrate a quasi one-dimensional electron system...
Laser cleaning of silicon surfaces (1998)
Leiderer, Paul, Boneberg, Johannes, Mosbacher, Mario, Schilling, Andreas, Yavas, Oguz
The continuing trend towards miniaturization of integrated circuits requires increasing effots and new concepts to clean wafer surfaces from dust particles. We report here about our studies of the...
Experimental Study of Laser-Induced Melting in Two-Dimensional Colloids (1998)
Wei, Qi-Huo, Bechinger, Clemens, Rudhardt, Daniel, Leiderer, Paul
We study the phase behavior of a charged two-dimensional colloidal system in the presence of a periodic light field composed of two interfering laser beams. Above a certain light intensity, the light...
Submicron contacts for electrical characterization of semiconducting WS2 thin films (1998)
Ballif, Christophe, Regula, Manfred, Lévy, Francis, Burmeister, Frank, Schäfle, Claudia, Matthes, Thomas, ...
We report a new method to characterize the local electronic properties of polycrystalline semiconducting thin films. A lattice of triangular gold electrodes, with a typical area of 0.2 mm2, is...
The mechanism of nanostructuring upon nanosecond laser irradiation of a STM tip (1998)
Boneberg, Johannes, Münzer, Hans-Joachim, Tresp, Michael, Ochmann, Michael, Leiderer, Paul
The mechanism of nanostructuring by illumination of scanning probe tips is examined. For that purpose the tip of a scanning tunneling microscope is illuminated with nanosecond and femtosecond laser...
Direct measurement of depletion potentials in mixtures of colloids and nonionic polymers (1998)
Rudhardt, Daniel, Bechinger, Clemens, Leiderer, Paul
In colloidal suspensions containing a binary mixture of hard spheres depletion forces occur which substantially contribute to the interaction of the larger spheres among themselves and a wall,...
Boneberg, Johannes, Leiderer, Paul
Time-resolved surface reflectivity measurements of nanosecond pulse laser-annealed Si thin films are compared to the simultaneously measured reflectivity of the interface between the film and glass...
Matthes, Thomas W., Sommerhalter, Christof, Rettenberger, Armin, Bruker, Patrik, Boneberg, Johannes, Lux-Steiner, Martha Christina, ...
The van-der-Waals surfaces (0001) of the layered structure semiconductors WS2 and WSe2 are known to be free of intrinsic surface states. Therefore, they provide an ideal system for investigations of...
STM investigation of the island growth of gold on WS2 and WSe2 (1998)
Rettenberger, Armin, Bruker, Patrik, Metzler, Michael, Mugele, Frieder, Matthes, Thomas, Böhmisch, Mathias, ...
We have investigated the island growth of Au on the van der Waals surfaces of WS2 and WSe2 by STM. We show how the STM can be used to image as well as to manipulate nm-sized crystallites on these...
Status and perspectives of the Mainz Neutrino Mass Experiment (1998)
Barth, H., Bornschein, Lutz, Degen, Beate, Fleischmann, L., Przyrembel, Michael, Backe, Hartmut, ...
The Mainz measurement in 1994 is discussed in the view of the problem of "negative m2" obtained in the analysis for larger energy intervals below the endpoint of the p spectrum. A possible...
Microwave study of surface electrons on helium films in a magnetic field (1998)
Mistura, Giampaolo, Tress, Oliver, Teske, Ekkehard, Shikin, Valeri, Wyder, Peter, Leiderer, Paul
We report preliminary results of a cyclotron resonance study of surface electrons (SE) on saturated helium films covering a PMMA substrate at T > 1 K. The real and imaginary parts of the dielectric...
From mesoscopic to nanoscopic surface structures : lithography with colloid monolayers (1998)
Burmeister, Frank, Schäfle, Claudia, Keilhofer, Bettina, Bechinger, Clemens, Boneberg, Johannes, Leiderer, Paul
Contact phenomena in 2D electron systems (1998)
Shikin, Valeri, Teske, Ekkehard, Leiderer, Paul, Wyder, Peter
A promising way ro investigate 2D contact phenomena is proposed. This method is based on the idea of depositing surface state electrons (SSE) on a thin layer of liquid helium covering the surface of...
Phase diagram of the screened two-dimensional electron crystal (1998)
Mistura, Giampaolo, Neser, Stephan, Leiderer, Paul
The melting line of the two-dimensional crystal formed by surface electrons above liquid helium films adsorbed on PMMA has been mapped out by means of a microwave cavity technique at temperature...
Mapping of surface potentials by electrons on a helium film (1998)
Teske, Ekkehard, Leiderer, Paul, Wyder, Peter, Shikin, Valeri
A novel way to investigate perturbations of the electrostatic potential across a sample surface is presented, aiming at application in 2D contact phenomena. The idea is to deposit surface state...
New design of a variable-temperature ultrahigh vacuum scanning tunneling microscope (1998)
Mugele, Frieder, Rettenberger, Armin, Boneberg, Johannes, Leiderer, Paul
We present the design of a variable-temperature ultrahigh vacuum (UHV) scanning tunneling microscope which can be operated between 20 and 400 K. The microscope is mounted directly onto the heat...
Boneberg, Johannes, Tresp, Michael, Ochmann, Michael, Münzer, Hans-Joachim, Leiderer, Paul
Nanosecond laser pulses are used to illuminate the very end of a tip of a scanning tunneling microscope in front of a gold surface. The transient increase of the tunneling current is measured as a...
Wei, Qi-Huo, Bechinger, Clemens, Rudhardt, Daniel, Leiderer, Paul
The presence of a modulated laser field can induce crystallization of a colloidal liquid where the particles interact via screened Coulomb pulsion. This phenomenon is called laser-induced Freezing...
Structure and dynamics of two-dimensional colloidal crystals in confined geometry (1998)
Bubeck, Ralf, Neser, Stephan, Bechinger, Clemens, Leiderer, Paul
The properties of two-dimensional (2D) colloidal crystals have been widely investigated during the last 20 years, but only little attention has been paid to effects of finite system size. We use...
The influence of tip-sample interaction on step fluctuations on Ag (111) (1998)
Mugele, Frieder, Rettenberger, Armin, Boneberg, Johannes, Leiderer, Paul
The fluctuations of the position of monatomic steps on Ag (111) are investigated by Scanning Tunneling Microscopy (STM). We analyze the influence of tip-sample interaction by varying the gap...
Investigation of photoinduced tunneling current and local surface photovoltage by STM (1998)
Matthes, Thomas W., Sommerhalter, Christof, Rettenberger, Armin, Böhmisch, Mathias, Boneberg, Johannes, Lux-Steiner, Martha Christina, ...
Photoassisted scanning tunneling microscopy was used to simultaneously image topoyraphy, photoinduced tunneling current and local surface photovoltage on an nm-scale. A novel interrupted z-feedback...
An approach to spectroscopy and phase measurements in scanning plasmon near-field microscopy (1998)
Boneberg, Johannes, Ochmann, Michael, Münzer, Hans-Joachim, Leiderer, Paul
A new optical setup for plasmon near-field optical microscopes is introduced which allows to improve the signal/background ratio independently of the wavelength used and therefore makes the...
Patterning of YBCO thin films by ion implantation and magneto-optical investigations (1997)
Kuhn, Marcus, Schey, Bernd, Klarmann, Ralph, Biegel, Wolfgang, Stritzker, Bernd, Eisenmenger, Johannes, ...
YBa2Cu3O7-d thin films deposited by pulsed laser deposition were patterned by ion implantation. The patterning technique is based on the local disordering of the crystal structure due to elastic...
3He impurity effects on the growth kinetics of 4He crystals (1997)
Suzuki, M., Thiel, M., Leiderer, Paul
We report the growth kinetics of the 4He crystals with a small amount of 3He impurities around 0.8 K. The growth resistance was measured using the response of the charged interface with respect to an...
Microwave study of screened two-dimensional electron crystals on helium films (1997)
Mistura, Giampaolo, Günzler, Tobias, Neser, Stephan, Leiderer, Paul
We report investigations at microwave frequencies on surface-state electrons (SSE) which were supported by helium films adsorbed on different polymer substrates at temperatures above 1 K. The real...
Böhmisch, Mathias, Burmeister, Frank, Rettenberger, Armin, Zimmermann, Jörg, Boneberg, Johannes, Leiderer, Paul
An atomic force microscope (AFM) was utilized as a Kelvin probe to determine work functions of several metals and semiconductors quantitarively. Most of the experimental data show excellent agreement...
The formation of nano-dot and nano-ring structures in colloidal monolayer lithography (1997)
Boneberg, Johannes, Burmeister, Frank, Schäfle, Claudia, Leiderer, Paul, Reim, D., Fery, Andreas, ...
Monolayers of colloidal particles formed in a self-organizingpmcess upon dryingof a colloidal suspension arc used as lithographic masks. After deposition of a thin metal layer, the mask is detached...
Scanning probe nanostructuring of YBa2Cu307 : a corrosion induced abrasion (1997)
Boneberg, Johannes, Böhmisch, Mathias, Ochmann, Michael, Leiderer, Paul
Nanostructuring experiments were performed on a YBa2Cu307 thin film surface with an atomic force microscope (AFM) with a conductive tip. Measurements of the local conductivity with the AFM tip show...
Direct observation of a buckling transition during the formation of thin colloidal crystals (1997)
Neser, Stephan, Palberg, Thomas, Bechinger, Clemens, Leiderer, Paul
We have investigated a colloidal suspension in a thin wedge formed by two glass plates in the presence of a lateral pressure. Starting with a single hexagonal layer, with increasing separation...
Hydrogen and helium films as model systems of wetting (1997)
Herminghaus, Stephan, Vorberg, Jens, Gau, Hartmut, Conradt, Robert N. J., Reinelt, Dietmar, Ulmer, Holger, ...
Optical experiments on the wetting properties of liquid 4He and molecular hydrogen are reviewed. Hydrogen films on noble metal surfaces serve as model systems for studying triple point wetting, a...
Finite-size effects on the closest packing of hard spheres (1997)
Neser, Stephan, Bechinger, Clemens, Leiderer, Paul, Palberg, Thomas
We study closely packed crystalline structures formed by slow lateral compression of a colloidal suspension of hard spheres in a thin wedge. In addition to the known sequence of structural...
Rettenberger, Armin, Leiderer, Paul, Probst, Matthias, Haight, Richard
Femtosecond-laser photoemission was used to investigate the electron dynamics in the layered semiconductors MoSe2 and WSe2. Photoexcitation with 200-fs pulses of 2.03 eV light creates an electron gas...
Tunneling spectroscopy on semiconductors with a low surface state density (1997)
Sommerhalter, Christof, Matthes, Thomas W., Boneberg, Johannes, Leiderer, Paul, Lux-Steiner, Martha Christina
A detailed study of tunneling spectroscopy concerning semiconductors with a low surface state density is presented. For this purpose, I V curves under dark conditions and under illumination were...
Junghöfer, Markus, Elbert, Thomas, Leiderer, Paul, Berg, Patrick, Rockstroh, Brigitte
This paper describes a uniform method for calculating the interpolation of scalp EEG potential distibution, the current source density (CSD), the cortical potential distribution (cortical mapping)...
Ion Beam Patterning of HTS-Thin Films (1997)
Kuhn, Marcus, Schey, Bernd, Biegel, Wolfgang, Stritzker, Bernd, Eisenmenger, Johannes, Leiderer, Paul
Ion implantation was used for patterning epitaxial YBCO-thin films. This patterning technique bases on a local disordering of the crystal structure of the MTS due to elastic collisions of the...
Stationary soliton on a charged surface of liquid helium and hydrogen films (1997)
Levchenko, Aleksandr Alekseevitsh, Kolmakov, German Valentinovich, Mezhov-Deglin, Leonid Pavlovich, Shikin, Valeri, Teske, Ekkehard, Leiderer, Paul
A change in the shape of a charged surface of liquid hydrogen and helium the formation of a solitary wave (a positively charged hump for hydrogen and a negatively charged dimple for helium) is...
Akari, Sabri, Matthes, Thomas W., Sommerhalter, Christof, Boneberg, Johannes, Leiderer, Paul
In the present study we demonstrate the ability of changing the electronic properties of a semiconductor surface by adsorbing polyelectrolytes. For this purpose polyethylenimine (PEI) polymers were...
Optical force microscopy with silicone rubber waveguides (1997)
Herminghaus, Stephan, Riedel, M., Leiderer, Paul, Bastmeyer, Martin, Stürmer, C.
A simple technique is described for optically imaging the lateral distribution of normal forces exerted onto a flat surface. It is based on the detuning of a silicone rubber planar waveguide by the...
Reversible laser annealing on YBa2Cu3O7-delta thin films (1997)
Eisenmenger, Johannes, Steinke, Rainer, Brand, C., Kambach, S., Hoffmann, M., Bechinger, Clemens, ...
High-temperature YBn2Cu307-d thin films were patterned by a laser writing technique based on the temperature increase in the focus of a laser beam. The corresponding local increase of the oxygen...
Study of Nucleation Processes during Laser Cleaning of Surfaces (1997)
Schilling, Andreas, Bischof, Jörg, Boneberg, Johannes, Leiderer, Paul
Bubble nucleation and growth dynamics on a nanosecond lime scale induced by pulsed laser heating or ucoustlc cavitation are scudied experimentally. Sensitive lest methods such as optical reflection...
Colloid monolayers as versatile lithographic masks (1997)
Burmeister, Frank, Schäfle, Claudia, Matthes, Thomas, Böhmisch, Matthias, Boneberg, Johannes, Leiderer, Paul
Hexagonally closed packed monolayers of colloids have found more and more applications, e.g. as lithographic masks. The monolayers are usually produced with the help of a self-organizing process...
Bubble nucleation and pressure generation during laser cleaning of surfaces (1997)
Schilling, Andreas, Bischof, Jörg, Boneberg, Johannes, Leiderer, Paul
Bubble nucleation and growth dynamics, on a nanosecond time scale, induced by pulsed laser heating of a liquidsolid interface are studied experimentally. A surface-plasmon probe is implemented as a...
Step roughness on Ag (111) investigated by STM : a systematic study of tip influence (1997)
Mugele, Frieder, Rettenberger, Armin, Boneberg, Johannes, Leiderer, Paul
We have investigated monatomic steps on Ag(111) by STM at different temperatures. At room temperature, the rough appearance of these steps is usually attributed to thermal step fluctuations. We have...
Steinke, Rainer, Hoffmann, M., Böhmisch, Mathias, Eisenmenger, Johannes, Dransfeld, Klaus, Leiderer, Paul
We used a quartz tuning fork vibrating at 30 kHz both as an acoustic near field microscope and at the same time as a microscopic Kelvin probe. One leg of the tuning fork carried a small gold...
Eisenmenger, Johannes, Kambach, S., Saleh, Said Ibrahim Ahmed, Tihi, Alen, Leiderer, Paul, Wallenhorst, Michael, ...
Using a reflection magneto-optic technique we have investigated natural inhomogeneities and artificial struetures in YBCO thin films exposed to an external magnetic field. The artificial structures...
Absolute pressure measurements on a nanosecond time scale using surface plasmons (1996)
Schilling, Andreas, Bischof, Jörg, Boneberg, Johannes, Leiderer, Paul
Transient acoustic waves generated by laser-induced bubble formation at a liquidsolid interface are sensitively monitored using optically excited surface plasmons. This method enables the detection...
Reversible laser patterning of YBa2Cu3O7-delta microbridges (1996)
Eisenmenger, Johannes, Brand, Christian, Leiderer, Paul
Thin films of YBa2Cu3O7-delta on MgO have been patterned using a laser writing technique based on the temperature increase in the focus of a laser beam. The corresponding local increase of the oxygen...
3He impurity effects on the growth kinetics of 4He crystals (1996)
Suzuki, M., Thiel, M., Leiderer, Paul
We report on the growth kinetics of 4He crystals with a small amount of 3He impurities around 0.8K. The growth resistance was measured using the response of the charged liquid-solid interface with...
Wetting behavior of superfluid 4He droplets on Cs (1996)
Reinelt, Dietmar, Gau, Hartmut, Herminghaus, Stephan, Leiderer, Paul
The temperature dependence of the dynamical behavior of 4He droplets inpinging on cesiated surfaces is investigated. Using surface plasmon microscopy pronounced differences in the structure of the...
Diffusive spreading of chainlike molecules on surfaces (1996)
Ala-Nissilä, Tapio, Herminghaus, Stephan, Hjelt, Tuomo, Leiderer, Paul
We study the diffusion and submonolayer spreading of chainlike molecules on surfaces. Using the fluctuating bond model, we extract the collective and tracer diffusion coefficients Dc and Dt with a...
Böhmisch, Mathias, Burmeister, Frank, Boneberg, Johannes, Leiderer, Paul
We present a method for the controlled fabrication of stable nanostructures under ambient conditions. The surfaces under consideration, WSe2, are imaged by an atomic force microscope. By applying a...
Theoretical Analysis of Neutron Scattering Spectra of 4He Films on Graphite (1996)
Clements, B. E., Godfrin, Henri, Krotscheck, Eckhard, Lauter, Hans J., Leiderer, Paul, Tymczak, C. J.
We compare microscopic calculations of the dynamic structure function of helium films adsorbed to a graphite substrate with neutron scattering data. Starting from a generalized Feynman theory of...
Excitations in a thin liquid 4He film from inelastic neutron scattering (1996)
Clements, B. E., Godfrin, Henri, Krotscheck, Eckhard, Lauter, Hans J., Leiderer, Paul, Passiouk, Valeria, ...
We perform a thorough analysis of the experimental dynamic structure function measured by inelastic neutron scattering for a low-temperature (T=0.65 K) four-layer liquid 4He film. The results are...
Dewetting modes of thin metallic films : nucleation of holes and spinodal dewetting (1996)
Bischof, Jörg, Scherer, Dieter, Herminghaus, Stephan, Leiderer, Paul
We have studied the dewetting of thin liquid metal films (Au, Cu, Ni) on fused silica substrates which occurs after melting with a Q-switched laser pulse. Optical microscopy, scanning electron...
Microbridge on YBa2Cu307-delta thin film patterned by reversible laser annealing (1996)
Eisenmenger, Johannes, Brand, Christian, Leiderer, Paul
A superconducting microbridge (14 μm wide, 140 μm long) on an epitaxial YBa2Cu3O7-d thin film was patterned by using a laser writing technique. The technique is based on a local increase of...
Behavior of thin metallic films upon melting with a ns-laser pulse (1996)
Bischof, Jörg, Reinmuth, Martin, Boneberg, Johannes, Herminghaus, Stephan, Palberg, Thomas, Leiderer, Paul
Thin metal films (Cu, An, Ni) and thin Si films with different thiknesses on fused silica were irradiated with a ns-pulse from a Nd:YAG-laser (y=532 om, FWHM 7 ns). In this paper we want to focus on...
Mugele, Frieder, Kloos, Christian, Leiderer, Paul, Möller, Rolf
We present the construction of a very compact scanning tunneling microscope (STM) which can be operated at temperatures between 4 and 350 K. The tip and a tiny tip holder are the only movable parts,...
Photochromic coloration of W03 with visible light (1996)
Bechinger, Clemens, Wirth, Eckehard, Leiderer, Paul
Thin anlorphous films of tungsten oxide (WO3) are well known to change heir optical absorption behavior upon light exposure, usually referred to as photochromic effect. Since the formation of color...
Tunable stimulated Raman scattering by pumping with Bessel beams (1996)
Klewitz, Steffen, Leiderer, Paul, Herminghaus, Stephan, Sogomonian, Suren
We report on a novel pumping scheme for stimulated Raman scattering (SRS) that uses a Bessel beam. We have used this scheme for SRS from molecular vibrations in acetone and from a polariton mode in a...
Evidence for quantum melting in the two-dimensional electron system on a thin helium film (1996)
Günzler, Tobias, Bitnar, Bernd, Mistura, Giampaolo, Neser, Stephan, Leiderer, Paul
The real and imaginary parts of the dielectric response of surface state electrons (SSE) on helium films adsorbed on oxidized Si platelets have been measured with a microwave cavity at 10 GHz....
Wetting phenomena in films of molecular hydrogen isotopes (1996)
Albrecht, U., Conradt, Robert N. J., Herminghaus, Stephan, Leiderer, Paul
We have investigated various aspects of the wetting behavior of hydrogen films (including the heavier isotopes) using surface plasmon resonance, light scattering, and photoelectron emission. Studies...
Electrical field induced growth of triangular nanometer structures on WSe 2 (1996)
Boneberg, Johannes, Lohrmann, Martin, Böhmisch, Mathias, Burmeister, Frank, Lux-Steiner, Martha Christina, Leiderer, Paul
We report on the conditions for the growth of triangular structures on WSe2 surfaces in scanning tunneling experiments with a vertical dimension of one layer (Se-W-Se) and up to 200 nm in horizontal...
Kinetics of crystal growth in charged colloidal suspensions (1995)
Palberg, Thomas, Würth, Mathias, Schwarz, J., Leiderer, Paul
We report on the solidification of a metastable colloidal melt of monodisperse, highly charged latex spheres. Light-scattering and video microscopy are used to study the growth velocities of crystals...
Molecular Effects in Ultra-Thin Liquid Film Spreading Dynamics (1995)
Herminghaus, Stephan, Siegel, U., Albrecht, U., Leiderer, Paul
The spreading dynamics of silicon oil films at thickness in the monolayer regime is studied by monitoring the evolution of the coverage profile with optically excited surface plasmons. While for...
Observation of Enhanced Viscosity of Wetting Layers of small Molecules (1995)
Herminghaus, Stephan, Paatzsch, Thomas, Häcker, T., Leiderer, Paul
The transport kinetics of wetting layers of ethanol and propane on silver substrates is investigated by monitoring the temporal decay of pulsed laser induced spatial thickness modulations. Our method...
Quantum fluids on alkali metal surfaces (1995)
Mistura, Giampaolo, Reinelt, Dietmar, Herminghaus, Stephan, Leiderer, Paul, Chan, Moses H. W.
The behaviour of quantum fluid films on alkali metal surfaces is investigated. Using the quartz microbalance technique, the wetting phase diagram can be explored by adsorption isotherm measurements....
Transport kinetics of wetting layers (1995)
Herminghaus, Stephan, Paatzsch, Thomas, Häcker, T., Leiderer, Paul
The transport kinetics of wetting layers of ethanol and propane on silver substrates is investigated by monitoring the temporal decay of pulsed-laser-induced spatial thickness modulations. Our method...
Bessel-beam-pumped tunable distributed-feedback laser (1995)
Klewitz, Steffen, Brinkmann, Frank, Herminghaus, Stephan, Leiderer, Paul
A distributed-feedback (DFB) dye laser that is pumped by a standing Bessel-beam wave is constructed. Because of the long line focus of the Bessel beam, the laser medium is pumped in only a very thin...
Ions at helium interfaces (1995)
The boundaries between different phases of condensed helium provide an interesting testing ground for studying ions in a quantum matter matrix. Here we consider the simplest positive and negative...
Thermovoltages in vacuum tunneling investigated by scanning tunneling microscopy (1995)
Hoffmann, D. H., Rettenberger, Armin, Grand, Jean Yves, Läuger, K., Leiderer, Paul, Dransfeld, Klaus, ...
By heating the tunneling tip of a scanning tunneling microscope the thermoelectric properties of a variable vacuum barrier have been investigated. The lateral variation of the observed thermovoltage...
Plasmon-induced tunneling currents : the influence of tip modes (1995)
Baur, Christof, Rettenberger, Armin, Dransfeld, Klaus, Leiderer, Paul, Koslowski, Bernd, Möller, Rolf, ...
The interaction of propagating surface plasmons (PSP) excited in a silver film with the tunneling junction of a scanning tunneling microscope has been investigated. Under particular conditions we...
Grain size control in polycrystalline colloidal solids (1995)
Palberg, Thomas, Mönch, Wolfgang, Schwarz, Jürgen, Leiderer, Paul
Recent experiments on the static and dynamic properties of polycrystalline colloidal solids show a pronounced influence of morphological details. Here we investigate several possibilities to vary...
Growth kinetics of body centered cubic colloidal crystals (1995)
Würth, Mathias, Schwarz, Jürgen, Culis, F., Leiderer, Paul, Palberg, Thomas
A combination of static light scattering and video microscopy is used to perform high precision measurements on the growth velocity of body centered cubic (bcc) crystals in a metastable colloidal...
Shear modulus titration in crystalline colloidal suspensions (1995)
Palberg, Thomas, Kottal, Johannes, Bitzer, Franz, Simon, Rolf, Würth, Mathias, Leiderer, Paul
We present the first direct experimental access to the actual surface charge number Z of colloidal particles under conditions of strong electrostatic interaction. We further calculate a renormalized...
Phase contrast surface mode resonance microscopy (1994)
Herminghaus, Stephan, Bechinger, Clemens, Petersen, W., Leiderer, Paul
A simple method is described which allows to obtain a phase sensitive image in surface mode resonance microscopy. It exploits the fact that surface mode resonances couple only to one dimtion of...
Optical and electrical properties of pulsed laser annealed thin Si films (1994)
Bischof, Jörg, Boneberg, Johannes, Dorfmüller, C.H., Keil, Manfred, Lux-Steiner, Martha Christina, Leiderer, Paul
Thin Si films used for solar energy purposes are commonly treated by relatively slow thermal annealing on a time scale of seconds to obtain the proper electrical behavior. We investigated a different...
Memory-Effect on Acoustic Cavitation (1994)
Yavas, Oguz, Leiderer, Paul, Park, Hee K., Grigoropoulos, Costas P., Poon, Chie C., Tam, Andrew C.
The formation of bubbles at a liquid-solid interface due to acoustic cavitation depends particularly on the preconditions of the interface. Here, it wiIl be shown that following laser-induced bubble...
Colloidal suspensions as model liquids and solids (1994)
Palberg, Thomas, Simon, R., Würth, Mathias, Leiderer, Paul
We here review some of our recent results on fluid-like and crystalline ordered colloidal suspensions. We have investigated the structure and the dynamical properties of strongly interacting charged...
Dynamical test of interaction potentials for colloidal suspensions (1994)
Bitzer, Franz, Palberg, Thomas, Löwen, Hartmut, Simon, R., Leiderer, Paul
An analytical formula for the ratio between the long- and short-time self-diffusion coefficirnt DL/DS is presented as a result of extensive Brownian dynamics simulations for Yukawa systems. In...
Herminghaus, Stephan, Boneberg, Johannes, Brüll, Peter, Bujok, V., Leiderer, Paul
We have investigated the short time dynamics flux distribution of thin YBa2Cu3O7-d films by means of time resolved magnetooptics. Local heating of the superconductor with a focussed laser pulse in a...
Park, Hee K., Grigoropoulos, Costas P., Poon, Chie C., Tam, Andrew C., Yavas, Oguz, Leiderer, Paul
The transient temperature and pressure field development in the excimer laser-induced vaporization of liquids in contact with a solid surface is studied. A thin silicon film, which has...
On the structure of thin 4He films on solid hydrogen (1994)
Mugele, Frieder, Albrecht, U, Leiderer, Paul
We have investigated the adsorption of 4He onto a quench-condensed H2 film by means of surface state electrons. Oscillations in the surface state electron conductivity clearly reveal the layerwise...
Leiderer, Paul, Park, Hee K., Grigoropoulos, Costas P., Poon, Chie C., Leung, Wing P., ...
The dynamics of liquid-vapor phase-change in the nanosecond time-scale induced by pulsed-laser heating of a liquid on a solid sample is studied by means of optical reflectance and scattering...
Charge dependent freezing line of Yukawa suspensions (1994)
Palberg, Thomas, Mönch, Wolfgang, Bitzer, Franz, Leiderer, Paul, Belloni, Luc, Bellini, T., ...
We present the freezing line of monodisperse colloidal latex spheres suspended in aqueous electrolyte as functlon of the number of ionic surface groups and the concentration of screening ions....
Herminghaus, Stephan, Siegel, U, Paatzsch, Thomas, Musil, Hans, Leiderer, Paul
Experiments were performed on the lateral transport kinetics of wetting layers. Optically excited surface plasmons were used to study both the spreading behaviour of silicon oil and the equilibration...
Phase transitions at quantum surfaces (1994)
The quantum systems helium and hydrogen provide a versatile testing ground for studying interfacial phenomena. As examples, both some properties of surface near thermodynamic equilibrium, like...
Determination of the shear modulus of colloidal solids with high accuracy (1994)
Palberg, Thomas, Kottal, Johannes, Loga, Tobias, Hecht, H., Simnacher, Erwin, Falcoz, F., ...
We report high accuracy and precision measurements of the shear modulus of colloidal solids formed from monodisperse charged latex spheres contained in an aqueous electrolyte. Standard preparational...
Yavas, Oguz, Leiderer, Paul, Park, Hee K., Grigoropoulos, Costas P., Poon, Chie C., Tam, Andrew C.
The enhancement of acoustic caviation at a liquid-solid interface following laser-induced bubble formation is studied. The experiment results indicate that metastable ultramicroscopic bubbles formed...
Photoinduced doping of thin amorphous WO3 films (1994)
Bechinger, Clemens, Herminghaus, Stephan, Leiderer, Paul
During exposure of thin amorphous WO3 films to UV light, both the optical absorptivity and the electrical conductivity increase. Using optically excited surface plasmons, we were able to measure even...
Solid hydrogen films in a nonequilibrium state (1994)
Conradt, Robert N. J., Albrecht, U., Herminghaus, Stephan, Leiderer, Paul
Molecular hydrogen can be prepared as a metastable quantum solid by quench-cndensation onto a substrate at sufficiently low temperature. Using surface plasmon resonance and light scattering...
Magnetic instability in HTSC films (1994)
Brüll, Peter, Bujok, V., Boneberg, Johannes, Herminghaus, Stephan, Leiderer, Paul
We have investigated the short time dynamics in the magnetic flux distribution of thin YBa2Cu3O7-x films by means of time resolved magnetooptics. Local heating of the superconductor with a focussed...
The dynamics of the photochromic effect in tungsten trioxide (1994)
Bechinger, Clemens, Ebner, Dieter, Herminghaus, Stephan, Leiderer, Paul
Based on the current model of the photochromic effect in thin films of tungsten trioxide, we propose a simple nonlinear rate equation which accounts very well for the details of the temporal...
Laser-annealing of thin semiconductor films (1993)
Boneberg, Johannes, Nedelcu, Johann, Bucher, Ernst, Leiderer, Paul
Optical reflectivity and transmissivity measurements have been used to investigate the dynamics of melting and recrystallisation of thin films of Si and Ge after laser-annealing with a ns...
Dynamics of the solidification of laser-annealed Si thin films (1993)
Boneberg, Johannes, Nedelcu, Johann, Bender, Hubert, Leiderer, Paul
Nanosccond time-resolved reflectivity and transmission measurements are used for the observation of solidification phenomena, following incomplete or complete melting of thin Si films (d = 125 nm) by...
Nucleation and growth of a flux instability in superconducting Y Ba2 Cu3 O7-x films (1993)
Leiderer, Paul, Boneberg, Johannes, Brüll, Peter, Bujok, V., Herminghaus, Stephan
Using a high speed magneto-optic technique we have investigated the dynamics of a new flux instability in thin superconducting Y Ba2 Cu3 O7-x films exposed to an external magnetic field of several 10...
Equilibration dynamics of wetting layers (1993)
Musil, Hans, Herminghaus, Stephan, Leiderer, Paul
A direct and quantitative investigation of the transport kinetics of wetting layers is presented. The temporal decay of pulsed laser induced spatial thickness modulations in liquid ethanol films on a...
On the fundamental role of oxygen for the photochromic effect of WO3 (1993)
Bechinger, Clemens, Oefinger, Gunther, Herminghaus, Stephan, Leiderer, Paul
The photochromic effect of thin amorphous W03 films, i.e., the coloration upon exposing the sample to ultraviolet light, has been investigated by means of optically excited surface plasmons. Due to...
Simon, Rolf, Palberg, Thomas, Leiderer, Paul
Electrostatically interacting colloidal suspensions at medium to very low concentrations were prepared in differently ordered phases using the method of continuous deionization. Equilibrium phase...
Wigner crystallization of two-dimensional electron systems on solid H2-films (1993)
Mugele, Frieder, Leiderer, Paul
We have investigated the transport properties of two-dimensional electron systems (2DES) on quench-condensed hydrogen films for various electron densities up to n=1.5x 10 cm -2. In the range of the...
Nanosecond magneto-optic study of a new instability in thin YBa2Cu3O7-x films (1993)
Bujok, V., Brüll, Peter, Boneberg, Johannes, Herminghaus, Stephan, Leiderer, Paul
We have investigated the dynamics of flux penetration into thin superconducting YBa2Cu307-x films using a magneto-optic technique with nanosecond time resolution. For films carrying large shielding...
Surface-plasmon-enhanced multiple-photon photoemission from Ag and Al films (1993)
Chen, H., Boneberg, Johannes, Leiderer, Paul
Photoemission from Ag and Al films, mediated by surface plasmons, was studied using a Q-switched Nd:YAG laser (where YAG denotes yttrium aluminum garnet) as a light source in the...
Pulsed-laser induced desorption and subsequent readsorption in ambient gas (1993)
Holler, Gregor, Albrecht, Uwe, Herminghaus, Stephan, Leiderer, Paul
We have investigated the phenomenon of readsorption after pulsed-laser induced thermal desorption during the presence of ambient gas. The temporal evolution of the readsorption of water has been...
Improved limit on the electron-antineutrino rest mass from tritium ß-decay (1993)
Weinheimer, Christian, Przyrembel, Michael, Backe, Hartmut, Barth, H., Bonn, Jochen, Degen, Beate, ...
The endpoint region of the β-spectrum of tritium was remeasured by an electrostatic spectrometer with magnetic guiding field. It enabled the search for a rest mass of the electron-antineutrino...
Yavas, Oguz, Do, Nhan, Tam, Andrew C., Leung, P.T., Leung, Wing P., Park, Hee K., ...
The temperature dependence of the optical properties for amorphous silicon is studied at wavelengths of 632.8 and 752 nm. Both the refractive index and extinction coefficient increase linearly with...
Yavas, Oguz, Leiderer, Paul, Park, Hee K., Grigoropoulos, Costas P., Poon, Chie C., Leung, Wing P., ...
Optical reflectance and light scattering measurements are used to study bubble nucleation of various liquids and subsequent explosive vaporization at the surface of a thin chromium film heated by a...
Near-field optical measurement of the surface plasmon field (1993)
Marti, Othmar, Bielefeld, Hartmut, Hecht, Bert, Herminghaus, Stephan, Leiderer, Paul, Mlynek, Jürgen
The intensity of the evanescent electromagnetic wave of optically excited surface plasmons was measured directly using a scanning tunneling optical microscope (STOM) setup. When resonant coupling of...
Monarkha, Yuri P., Albrecht, Uwe, Kono, Kimitoshi, Leiderer, Paul
A detailed theoretical analysis of the conductivity of surface electrons above a thin liquid-helium film covering an uneven solid-hydrogen surface is presented. The pronounced conductivity anomaly...
Annealing behavior of quench-condensed hydrogen and deuterium films (1993)
Albrecht, Uwe, Evers, Peter, Leiderer, Paul
We have studied the annealing behavior of thin molecular hydrogen and deuterium films (typical thickness 10 nm) prepared by quench-condensation at 1.5 K on a silver substrate. Changes in the optical...
Diffusive two-dimensional spreading of a polymer (1993)
Albrecht, Uwe, Otto, Achim, Leiderer, Paul
We have measured the thickness profiles of ultrasmall (picoliter volume) droplets of polydimethylsitoxane during their spreading on a silver surface at central thicknesses below one monolayer. The...
Surface state electrons on quench-condensed hydrogen films as a surface probe (1993)
Albrecht, Uwe, Leiderer, Paul, Kono, Kimitoshi
The surface of quench-condensed hydrogen films was studied employing conductivity measurements of surface state electrons (SSE). The surface quality of the films could be drastically improved by...
Possible correlation effects of surface state electrons on a solid hydrogen film (1992)
Mugele, Frieder, Albrecht, Uwe, Leiderer, Paul, Kono, Kimitoshi
We have investigated the transport properties of surface state electrons on thin quench-condensed hydrogen films for various electron densities. The surface state electron mobility showed a...
Stress-induced melting and surface instability of 4He crystals (1992)
Thiel, Michael, Willibald, Arnold, Evers, Peter, Levchenko, Aleksandr Alekseevitsh, Leiderer, Paul, Balibar, Sébastien
The response of the interface between liquid and solid 4He is investigated when the helium crystal is exposed to uniaxial stress. It is observed that part of the crystal melts, the change in height...
Investigation of quantum systems with surface plasmons and surface state electrons (1992)
We report on investigations of thin films of the quantum systems hydrogen and helium both in thermodynamic equilibrium and in metastable states. Information about the film thickness and surface...
Possible correlation effects of surface state electrons on a solid hydrogen film (1992)
Mugele, Frieder, Albrecht, Uwe, Leiderer, Paul, Kono, Kimitoshi
We have investigated the transport properties of surface state electrons on thin quench-condensed hydrogen films for various electron densities. The surface state electron mobility showed a...
Optical reflectivity of si above the melting point (1992)
Boneberg, Johannes, Yavas, Oguz, Mierswa, Bernhard, Leiderer, Paul
The variation of the optical reflectivity of a Si single during irradiation with two successive Nd:YAG laser pulse is investigated with ns resolution. The first pulse melts the surface and therefore...
4He films on graphite studied by neutron scattering (1992)
Lauter, Hans J., Godfrin, Henri, Leiderer, Paul
The properties of 4He films adsorbed on graphite have been studied by neutron scattering. In particular excitations of the commensurate phase of the monolayer are discussed. The first two adsorbed...
Picard, Antoni, Backe, Hartmut, Bonn, Jochen, Degen, Beate, Haid, R., Hermanni, Antje, ...
This paper reports on precision measurements of conversion lines in the decay of 83mKr with nuclear transition energies of 32.1 keV and 9.4 keV, respectively. The spectra were taken from a...
Unexpected hydrodynamic behavior of multielectron bubbles in liquid helium I (1992)
We have investigated multielectron bubbles (with charges Z ~ 106 electrons) in normal liquid 4He. The drift velocity in an electric field and the charge of the bubbles were measured simultaneously....
Two-dimensional liquid polymer diffusion : experiment and simulation (1992)
Albrecht, Uwe, Otto, Achim, Leiderer, Paul
The spreading profiles of small (picoliter) droplets of polydimethylsiloxane on silver surface have been monitored in the thickness range below one monolayer. The profile shapes are distinctly...
Ripplons in 4He films observed by neutron scattering (1992)
Lauter, Hans J., Godfrin, Henri, Frank, V. L. P., Leiderer, Paul
We report the first observation of ripplon excitations at large wave vectors. The experiments were performed on liquid-4He films of atomic thickness adsorbed on a graphite substrate....
Kirchgässner, David, Brüll, Peter, Leiderer, Paul
We have investigated the magnetic field distribution of an epitaxial Y Ba2 Cu3 O7-x film and compared the result with a theoretical calculation which has recently been proposed. This model takes into...
Magnetic-Field-Induced Damage in a Superconducting YBa2Cu3O7-x Film (1992)
Brüll, Peter, Leiderer, Paul, Kirchgässner, David, Berberich, Paul, Kinder, Helmut
During investigations of the magnetic flux dynamics in thin superconducting YBa2Cu3O7-x films we have observed the spontaneous formation of a damage in the film, apparently induced by the applied...
Influence of a protective coating on the aging of epitaxial YBa2Cu3O7-x films (1992)
Brüll, Peter, Steinke, Rainer, Leiderer, Paul, Schubert, J., Zander, W., Stritzker, Bermd
The influence of aging and temperature cycling effects on thin epitaxial YBa2Cu3O7-x films on (100) SrTiO3 has been investigated over a period of 15 months using measurements of the spatial magnetic...
Resonant phenomena in colloidal crystals (1992)
Palberg, Thomas, Würth, Mathias, König, Peter, Simnacher, Erwin, Leiderer, Paul
Colloidal crystals of completely deionized suspensions of latex speres are subjected to oscillatory and steady shear, as well as to homogeneous and inhomogeneous electric fields. Various resonant...
Electrons at the surface of quantum systems (1992)
Electrons can be trapped at the surfaces and interfaces of the condensed phases of quantum matter (in particular hydrogen and helium), where they form classical two-dimensional Coulomb systems. Apart...
Time resolved study of excimer laser ablation of thin organic films from a metal surface (1991)
Herminghaus, Stephan, Leiderer, Paul
The dynamics of pulsed excimer laser ablation of thin films of organic material from a metal surface was investigated using optically excited surface plasmons. The metal substrate is formed by a 500...
Observation of symmetric patterns in the flux distribution of thin YBa2Cu307-x films (1991)
Brüll, Peter, Kirchgässner, David, Leiderer, Paul
We have investigated the magnetic field distribution in epitaxial YBa2Cu3O7-x films on square SrTiO3 and MgO substrates. In fields between 20 mT and IT a magnetooptic method was applied, complemented...
Detection of surface plasmons by scanning tunneling microscopy (1991)
Möller, Rolf, Albrecht, U., Boneberg, Johannes, Koslowski, Berndt, Leiderer, Paul, Dransfeld, Klaus
The influence of surface plasmons excited in a polycrystalline silver film on the tunneling current of a scanning tunneling microscope (STM) has been analyzed. The plasmons cause an additional flow...
Neutron Scattering Studies of Quantum Films (1991)
Lauter, Hans J., Godfrin, Henri, Frank, V. L. P., Leiderer, Paul
The phase diagrams of a monolayer of adsorbed gases or light molecules on flat substrates look similar to the phase diagrams in 3-dimensions (3-D). This means that the usual coexistence regions, the...
Nanosecond time-resolved study of pulsed laser ablation in the monolayer regime (1991)
Herminghaus, Stephan, Leiderer, Paul
Pulsed laser ablation of few angstroms or organic material is investigated on a nanosecond time scale for the first time. The use of optically excited surface plasmons as a probe provides high...
Magnetic Flux Distribution in YBa2Cu307-x (1991)
Leiderer, Paul, Brüll, Peter, Steinke, Rainer, Feile, Rudolf
The spatial distribution of magnetic flux in YBa2CY307-x has been measured for various sinzered pellets and thin films. In ring-shaped samples macroscopic persistent currents have been observed. Tn...
Albrecht, Uwe, Dilger, Herbert, Evers, Peter, Leiderer, Paul
We describe the use of optically excited surface plasmons to measure the thickness of ultrathin films deposited on gold and silver surfaces with submonolayer resolution. Additional structural...
Forced rayleigh scattering in mixtures of colloidal particles (1991)
Palberg, Thomas, Simon, Rolf, Leiderer, Paul
In this work, forced Rayleigh scattering is combined with a new deionization technique to measure the self-diffusion coefficient of strongly interacting charged polystyrene particles. For each...
Surface state electrons on a hydrogen film (II) : influence of adsorbed helium films (1991)
Kono, Kimitoshi, Albrecht, Uwe, Leiderer, Paul
We have investigated the conductivity of surface state electrons on liquid 4He films supported by a quench-condensed thin solid hydrogen substrate. A pronounced dip in the ac-conductivity was...
Surface-state electrons on a hydrogen film (I) : annealing of the film (1991)
Kono, Kimitoshi, Albrecht, Uwe, Leiderer, Paul
We have investigated the surface of thin films (thickness ~2 mm) of solid H2 between 1.5 and 4.2K by measuring the ac conductivity of surface-state electrons (SSE). The films were prepared on a glass...
Rotational excitation and out-of-plane vibration of Para-H2 and HD adsorbed on graphite (1990)
Armony, J. L., Frank, V. L. P., Lauter, Hans J., Leiderer, Paul
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Zone center phonon gap in the commensurate phase of 3He adsorbed on graphite (1990)
Frank, V. L. P., Lauter, Hans J., Godfrin, Henri, Leiderer, Paul
Excitations in the commensurate phase on CD4 adsorbed on graphite (1990)
Moeller, T., Lauter, Hans J., Frank, V. L. P., Leiderer, Paul
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Direct observation of ripplons in 4He films by neutron scattering (1990)
Godfrin, Henri, Frank, V. L. P., Lauter, Hans J., Leiderer, Paul
Electrophoretic light scattering in ordered colloidal suspensions (1990)
Deggelmann, Martin, Palberg, Thomas, Leiderer, Paul, Versmold, Heinrich, Weber, R.
Electrophoretic light scattering (ELS) in the presence of electroosmosis is performed on PS- and PMMA-latex spheres with several experimental setups and different cell geometrics. Theoretical...
4He Films on Graphite Studied by Neutron Scattering (1990)
Lauter, Hans J., Godfrin, Henri, Frank, V. L. P., Leiderer, Paul
Macroscopic persistent currents in laser ablated YBa2Cu3O7-x films (1990)
Stritzker, Bernd, Leiderer, Paul, Feile, Rudolf, Krüger, U., Zander, W.
Thin films of YBa2Cu3O7-x have been produced in situ by laser ablation. As the condensation of the superconducting film is done onto hot substrates (600-780°C) at high oxygen pressures (- 1 mbar),...
Investigation of the epitaxy of thin YBa2Cu3O7-delta films (1990)
Weimer, Ute, Feile, Rudolf, Leiderer, Paul, Poppe, Ulrich, Schubert, J., Fröhlingsdorf, Joachim, ...
The degree of epitaxy of thin sputtered and laser ablated films have been investigated by Raman spectroscopy. Using the selection rules for Raman scattering for the different phonons in...
Surface plasmon enhanced transient themoreflectance (1990)
Herminghaus, Stephan, Leiderer, Paul
It is shown that optically excited surface plasmons can be used for measurements of the surface temperature of a metal with nanosecond the resolution. This method is closely related to transient...
Stability of solid T2 films (1990)
Przyrembel, Michael, Fischer, H., Hermanni, Antje, Otten, Ernst-Wilhelm, Leiderer, Paul
Films of molecular tritium, physisorbed on a cold substrate, have been investigated by means of ellipsometry. A significant effect of the radioactive decay processes on the desorption kinetics and...
Lattice Dynamics of Commensurate Monolayers Adsorbed on Graphite (1990)
Lauter, Hans J., Frank, V. L. P., Taub, H., Leiderer, Paul
A review of the lattice dynamics of gases adsorbed on graphite in the commensurate phase is presented, taking into account their quantum character. The phonon dispersion curves are characterized by...
Surface state electrons on solid hydrogen films (1990)
Albrecht, Uwe, Dilger, Herbert, Leiderer, Paul, Kono, Kimitoshi
We investigated the surface of quench condensed hydrogen films on a glass substrate by measuring the conductivity of surface state electrons (SSE) between 1.5 and 4.2 K. Initially the films were very...
Superfluid density in metastable 3He-4He mixtures (1990)
Bodensohn, Joachim, Leiderer, Paul
We have studied superfluid 3He-4He mixtures quenched into nonequilibrium states inside the miscibility gap by means of second sound. From the results for the second sound velocity we conclude that...
Flux distribution in polycrystalline YBa2Cu3O7 (1990)
Leiderer, Paul, Brüll, Peter, Klumpp, Thomas, Stritzker, Bernd
The spatial distribution of the magnetic flux in polycristalline films and sinter pellets has been measured. Pronounced symmetric structures on a mm scale are observed in a field range of a few Gauss.
Second sound in metastable and phase-separated 3He- 4He mixtures (1990)
Bodensohn, Joachim, Leiderer, Paul
Propagation of second sound has been used to study superfluid 3He- 4He mixtures quenched into nonequilibrium states inside the miscibility gap. From the results for the second-sound velocity we...
Phases and Phase Transitions of D2 on Graphite obtained by variable 4He Pressure (1989)
Frank, V. L. P., Lauter, Hans J., Leiderer, Paul
Phases and phase transitions of D2 on graphite have been investigated using 4He as 2-dimensional pushing-gas. A quite unusual path in the D2 phase diagram is followed when the 2-dimensional...
Homogeneous Nucleation in Liquid 3He-4He Mixtures (1989)
Bodensohn, Joachim, Klesy, Stephan, Leiderer, Paul
We have investigated the rate of homogenous nucleation in liquid 3He-4He mixtures as a function of the speed at which the system is quenched into the miscibility gap below the tricritical point....
Improved attenuated total reflectance technique for the investigation of dielectric surfaces (1989)
Herminghaus, Stephan, Leiderer, Paul
Guided wave surface polaritons (GWSPs) propagating in a dielectric slab adjacent to a metal surface are investigated both theoretically and experimentally. It is shown that GWSPs can be used for...
Excitations in the commensurate phase of H2, D2 and HD on graphite (1989)
Lauter, Hans J., Frank, V. L. P., Leiderer, Paul, Wiechert, H.
We measured the excitations of the hydrogen Isotopes (Hz, HD, D2) adsorbed on graphite in the commensurate phase. A simple model of two inplane springs reproduces well the observed neutron spectra...
Macroscopic persistent currents in laser deposited YBa2Cu307 films (1989)
Fröhlingsdorf, Joachim, Zander, W., Stritzker, Bernd, Feile, Rudolf, Leiderer, Paul
We have investigated persistent currents in a superconducting YBa2lCuO7 ring of about 1 cm diameter, which was deposited as c-axis textured film on a SrTiO3 substrate by laser ablation. The currents...
Temperature Effects on the Phonon Spectrum in YBa2Cu3O7 Single Crystals and Thin Films (1989)
Feile, Rudolf, Leiderer, Paul, Kowalewski, Jerzy, Assmus, Wolf, Schubert, J., Poppe, Ulrich
We have performed a detailed investigation of the temperature dependence of the 385cm-1 phonon in single crystals and thin films of the YBa2Cu3O7 superconductor by means of Raman spectroscopy. In the...
Fast One Step Preparation of High Quality YBa2Cu3O7-x Thin Films by Laser Ablation (1989)
Fröhlingsdorf, Joachim, Leiderer, Paul, Feile, Rudolf, Zander, W., Stritzker, Bernd
Thin films of YBa2Cu3O7-x have been produced in situ by laser ablation without further low temperature annealing. Films were found to be polycrystalline with the c-axis preferentially oriented normal...
One millisecond of light suffices to suppress nighttime pineal melatonin synthesis in rats (1989)
Vollrath, Lutz, Seidel, A., Huesgen, A., Manz, B., Pollow, Kunhard, Leiderer, Paul
The effcct of a single high-intensity light pulse with a duration of 1 ms on nighttime pineal activity of male Sprague-Dawley rats was investigated. 10 minutes after light exposure pineal...
Puderbach, Stefan, Herminghaus, Stephan, Leiderer, Paul
Optically excited surface plasmons have been used as a probe for pulsed laser desorption of organic compounds from a metal surface. Changes in the adsorbed film thickness less than 1 Å are easily...
Phonons in the commensurate monolayer of D2 on graphite (1988)
Frank, V. L. P., Lauter, Hans J., Leiderer, Paul
The in-plane phonons of the commensurate monolayer of deuterium adsorbed on graphite have been measured. They show evidence for dispersion rather than completely localized mode character. In addition...
Macroscopic persistent currents in YBa2Cu3O7 (1988)
Persistent currents in polycrystalline YBa2Cu3O7 rings have been investigated by measuring the spatial distribution of the magnetic flux trapped in field-cooled samples. The results unambiguously...
Raman experiments on YBaCuO-superconductors (1988)
Feile, Rudolf, Schmitt, U., Leiderer, Paul
YBaCuO-superconductors (sintered ceramics, sputtered films and single crystallites) prepared by different laboratories have been investigated by Raman spectroscopy. In addition we have performed...
Temperature effects on the phonon spectrum in YBa2Cu3O7 single crystal and thin films (1988)
Feile, Rudolf, Leiderer, Paul, Kowalewski, Jerzy, Assmus, Wolf, Schubert, J., Poppe, Ulrich
We have performed detailed investigations on the temperature dependence of the 335 cm1 phonon in single crystals and thin films of the YBa2Cu3O7 superconductor. The frequency of this phonon...
Characterization of thin superconducting YBACuO-films by Raman-spectroscopy (1988)
Feile, Rudolf, Schmitt, U., Leiderer, Paul, Schubert, J., Poppe, Ulrich
We have investigated thin sputtered films of the high Tc material YBa2Cu3O7 by means of Raman spectroscopy at different stages of the preparation process. We find that the films are amorphous after...
Backe, Hartmut, Bonn, Jochen, Edling, Thomas, Fischer, H., Hermanni, Antje, Leiderer, Paul, ...
A new type of electron spectrometer is under construction at Mainz University that allows a measurement of the β-spectrum of tritium with high resolution and transmission in order to determine...
Excitations in the soliton phase of D2 on graphite (1987)
Frank, V. L. P., Lauter, Hans J., Leiderer, Paul
The transverse phonon at the zone boundary has been studied in the commensurate(C)-phase of D2 adsorbed on graphite with inelastic neutron scattering. This excitation looses intensity and shows a...
Properties of multielectron bibbles in liquid helium (1987)
We report charge and velocity measurements on multielectron bubbles in liquid helium. Oscillations and fissioning of bubhles are observed.
Multielectron bubbles in liquid helium (1987)
We have investigated multielectron bubbles in liquid 4He, which develop when the charged helium surface undergoes an electrohydrodynamic instability. Well-defined bubbles with charges ranging from 10...
Stepwise layering of helium films on solid hydrogen (1987)
Cieslikowski, Detlef H., Leiderer, Paul, Dahm, Arnold J.
The mobility of surface bound electrons is monitored as helium is adsorbed on a hydrogen substrate. Maxima in the mobility occur at the completion of each helium monolayer. Up to nine maxima are...
Investigation of thin helium films with surface bound electrons (1987)
Cieslikowski, Detlef H., Dahm, Arnold J., Leiderer, Paul
We have measured the mobility of electrons above 3He and 4He films condensed on a solid hydrogen substrate. Oscillations in the mobility as a function of film thickness indicate substantial layerwise...
Tunneling and point contact investigations of La1.85Sr0.15CuO4 (1987)
Leiderer, Paul, Feile, Rudolf, Renker, Burkhard, Ewert, D.
The high-T c superconductor La1.85Sr0.15CuO4 was investigated by means of point contact and tunneling measurements on small-sized contacts. We find different values for the energy gap at different...
Mobility oscillations of electrons on thin He films (1987)
Cieslikowski, Detlef, Leiderer, Paul, Dahm, Arnold J.
We have studied electrons above liquid films of 3He and 4He condensed on various solid substrates. For helium films on solid hydrogen, pronounced oscillations of the electron mobility are observed as...
Surface tension of 4He near the critical point (1986)
Herminghaus, Stephan, Leiderer, Paul
We have measured the surface tension σ of 4He near its liquid-gas critical point. The effective vritical exponent for σ in the temperature interval 0.030less,...
The growth of atomically rough 4He crystals (1986)
Bodensohn, Joachim, Nicolai, Klaus, Leiderer, Paul
We have studied the growth of atomically rough bcc and hcp4He crystals from the superfluid phase for temperatures T > 0.9 K. The growth coefficient displays a temperature dependence which can be...
Spatial development of multiple-gap states in nonequilibrium superconductors (1985)
Schreyer, H., Dietsche, W., Kinder, Helmut, Leiderer, Paul
We have studied the gap instability in a superconductor under tunneling injection at high voltages by probing the spatial distribution of the phonon emission. A high sensitivity was achieved by using...
Kapitza resistance of laser-annealed surfaces (1984)
Basso, Heitor C., Dietsche, W., Kinder, Helmut, Leiderer, Paul
Stability of electrons on superfluid 4He films (1984)
Etz, Henrik, Gombert, W., Leiderer, Paul
The stability of 2-dimensional electron systems on saturated films of superfluid 4He has been investigated. Electron densities up to 10 11 cm-2 have been observed to be stable, nearly two orders of...
Electrons at helium interfaces (1984)
Two-dimensional layers of charges trapped at the boundaries between the various helium phases strongly interact with these interfaces at high electric fields. The coupling, which leads to an...
Stability of charged 4He films (1984)
Etz, Henrik, Gombert, W., Idstein, Werner, Leiderer, Paul
We have investigated the stability of electrons above saturated films of superfluid 4He on both insulating and conducting substrates. Electron densities of up to 10 11 cm-2 have been observed to be...
Elliptical multielectron dimples on liquid and solid helium surfaces (1983)
Shikin, Valeri, Leiderer, Paul
The structure of multielectron dimples on helium substrates is investigated for conditions deviating from axial symmetry. Main sources for an ellipticity of dimples are an anisotropy of the surface...
Macroscopic electron dimples on the surface of liquid helium (1982)
Leiderer, Paul, Ebner, W., Shikin, Valeri
We have investigated the self-trapping of electrons in macroscopic dimples on the surface of liquid 4He. The existence of individual multielectron dimples is demonstrated.
Saturation of the anomalous Kapitza conductance (1982)
Schubert, H., Leiderer, Paul, Kinder, Helmut
The reflection coefficient of longitudinal 25-GHz phonons was measured at normal incidence on quartz-liquid 4He interfaces. For clean samples, close agreement with the Khalatnikov theory was found...
Anisotropic decomposition of 3He-4He mixtures (1982)
Benda, Th., Alpern, Peter, Leiderer, Paul
The late stage of phase separation in 3He-4He mixtures, quenched into the miscibility gap below the tricritical point, has been studied by light scattering. The scaled structure factor F(k / km),...
Metastability and nucleation of 3He-4He mixtures near the tricritical point (1982)
Alpern, Peter, Benda, Th., Leiderer, Paul
Homogeneous nucleation of phase separation has been investigated in liquid 3He-4He mixtures. Near the tricritical point the maximum supercooling marking the boundary of the metastable region is...
Charge-induced instability of the 4He solid-superfluid interface (1982)
Savignac, Dominique, Leiderer, Paul
The interface between crystalline and superfluid 4He, when charged with negative ions, is deformed as a result of melting and crystallization processes. As long as the electric field normal to the...
Decomposition of 3He-4He mixtures near the tricritical point (1981)
Benda, T., Alpern, Peter, Leiderer, Paul
Light scattering measurements on decomposing 3He-4He mixtures are reported for temperatures near the tricritical point. The results deviate from those obtained for common critical systems. This may...
Multielectron dimples on the surface of liquid 4He (1981)
Leiderer, Paul, Ebner, W., Shikin, Valeri
We have investigated the self-trapping of electrons in macroscopic dimples on the surface of liquid 4He. The existence of individual multielectron dimples is demonstrated.
Universality of tricritical 3He-4He mixtures under pressure (1980)
The phase diagram of liquid 3He-4He mixtures in the vicinity of the tricritical point has been determined at saturated vapor pressure and at 22.6 bars, close to solidification. Neither the critical...
Development of the dimple instability on liquid 4He (1980)
Electrons on the surface of liquid 4He have been used to study the transition from a homogeneous two-dimensional charge distribution to the modulated charge density regime where the so-called dimple...
Die Grenzfläche von 3He-4He Mischungen (1980)
Am Beispiel der Grenzfläche von physenseparierten 3He-4He-Mischungen werden die Eigenschaften von neutralen und elektrisch geladenen Flüssigkeitsgrenzflächen untersucht. Eine Belegung mit...
Saturation effects in the phonon reflection at a quartz-liquid helium interface (1980)
Schubert, H., Leiderer, Paul, Kinder, Helmut
The reflection coefficient of longitudinal 25-GHz phonons at a quartz-liquid 4He interface was measured for various phonon intensities. For thoroughly cleaned quartz surfaces a reflection coefficient...
Wanner, Manfred, Leiderer, Paul
The interface of phase-separated 3He-4He mixtures, when charged with negative ions, shows a pronounced softening of its ripplon spectrum at wave vectors around the inverse capillary length. As the...
Structure of the dimple lattice on liquid 4He (1979)
Leiderer, Paul, Wanner, Manfred
Electrons on the surface of liquid 4He become localized in macroscopic dimples when the electric field perpendicular to the surface exceeds a critical value. These dimples, each holding about 10 7...
Charged interface of 3He-4He-mixtures : softening of interfacial waves (1979)
The excitation spectrum of ripplons at the charged interface of phase-separated 3He-4He mixtures has been determined for electric fields E up to Ec, given by the stability limit of the interface. The...
Positive-Ion Structure in a Tricritical 3He-4He Mixture (1978)
Leiderer, Paul, Wanner, Manfred
The mobilities of positive and negative ions have been measured in the normal phase of a 3He-4He mixture near the tricritical point. Whereas for negative ions nearly the same weak temperature...
Ions at the Critical Interface of 3He-4He Mixtures (1978)
Wanner, Manfred, Leiderer, Paul, Reverchon, T.
Trapping of ions at the interface of 3He---4He mixtures has been studied near the tricritical point. The soft critical interface leads to a strong dependence of the trapping times both on...
Ions at the Critical Interface of 3He-4He Mixtures (1978)
Leiderer, Paul, Wanner, Manfred, Schoepe, Wilfried
Trapping of positive and negative ions at the interface of 3He-4He mixtures has been studied. Due to the critical behavior the transmission of ions through the interface increases sharply as the...
Interfacial tension near the tricritical point in 3He-4He mixtures (1977)
Leiderer, Paul, Poisel, Hans, Wanner, Manfred
The interfacial tension sgr1 of phase-separated3He-4He mixtures has been measured between 0.5 K and the tricritical point. The observed decrease of sgr i on approaching the tricritical point is much...
Optical Experiments in 3He-4He Mixtures Near the Tricritical Point (1977)
In the vicinity of a critical point, a number of important properties can be determined by means of optical methods. As an example let us consider a binary mixture near its consolute critical point...
Berberich, Paul, Leiderer, Paul, Hunklinger, Siegfried
The attenuation of longitudinal 1-GHz phonons was measured as a function of temperature in liquid 4He at svp and at 23 bar as well as in hcp 4He at 36 bar. The lifetime of the phonons which were...
Tricritical slowing down of superfluid dynamics in 3He-4He mixtures (1975)
Leiderer, Paul, Nelson, David R., Watts, D. R., Webb, Watt W.
Measurements of the Rayleigh scattering by concentration fluctuations in the coexisting superfluid in 3He-4He mixtures near the tricritical temperature Tt show a single Lorentzian line of width such...
Light scattering by 3He-4He mixtures near the tricritical point (1974)
Leiderer, Paul, Watts, D. R., Webb, Watt W.
Scattering intensity and related measurements have established the tricritical exponents for the divergences of the concentration susceptibility, γ, and of the correlation length for...
Lifetimes of hypersonic phonons in solid 4He (1974)
Leiderer, Paul, Berberich, Paul, Hunklinger, Siegfried, Dransfeld, Klaus
The quantum liquid "superfluid helium" shows several outstanding properties as compared to normal liquids. In contrast to this the quantum crystal "solid helium" (in the foIlowing we shall only...
Two chambers filled with superfluid helium to different levels were connected by a small orifice (10-15 μm). The flow of the liquid through the orifice was modulated by a sound field. With one...
Measurement of the hypersonic attenuation by means of stimulated Brillouin Scattering (1973)
Leiderer, Paul, Berberich, Paul, Hunklinger, Siegfried
A light scattering technique to determine the lifetime of longitudinal phonons in the GHz range is described. The method allows one to measure phonon lifetimes between 5 and 1000 nsec and is...
Measurement of hypersonic attenuation by means of stimulated Brillouin scattering. (1973)
Kurzfassung in: Rev. Sci. Instrum. Vol. 44. 1973, No. 11.
Hyperschallausbreitung im Quantenkristall He 4. (1972)
München, Techn. Univ., Diss., 1973.
The elastic constants of solid argon determined by stimulated Brillouin scattering (1972)
Meixner, Hans, Leiderer, Paul, Berberich, Paul, Lüscher, Edgar
The temperature dependence of the longitudinal sound velocities in the [1OO]- and [110]-directions has been measured in single crystals of argon in a temperature range from 4.2 K to 77 K by...
Ultrasonic Attenuation in Fused Silicia at High Frequencies and Low Temperatures (1972)
Arnold, W., Baumann, J., Berberich, Paul, Hunklinger, Siegfried, Leiderer, Paul, Nava, R., ...
Measurements of the attenuation of longitudinal and transverse sound waves of frequencies between 30 MHz and 29 GHz were carried out at temperatures from 1.1 K to 10 K in fused silica. In the upper...
Investigation of solid He4 by stimulated brillouin scattering (1971)
Hunklinger, Siegfried, Leiderer, Paul, Berberich, Paul
Solid helium is generally referred to as a quantum crystal because its zero point energy is cornpaFable to the binding energy. Consequently one expects its behaviour to be quite different from...
Temperature dependence of the hypersonic velocity in a single crystal of argon (1971)
Meixner, Hans, Leiderer, Paul, Lüscher, Edgar
The temperature dependence of the longitudinal sound velocity in the [100]-direction has been measured in a single crystal of argon in a temperature range from 4,2°K to 77°K by stimulated Brillouin...
Influence of impurities on the laser induced breakdown in liquid He4 (1971)
Hunklinger, Siegfried, Leiderer, Paul
The threshold power for laser induced breakdown in liquid Hc4 has been investigated above and below the α-transition. The results seem to indicate that the threshold power is mainly determined...
Mutual Friction and the Thermal Conductivity of Helium Near T Lambda (1970)
Temperature gradients in superfluid helium carrying a heat current in a 13.8-mm-wide tube or in a 0.1-mm-wide slit have been measured at 0.09 m°KlambdaT
Critical Currents in Superfluid Helium Near T Lambda (1969)
The temperature dependence of the critical heat current Qc in He II has been measured in the temperature region 3·10-5(°K) < Tλ-T< 1.2·10-2(°K). The result Qc int (Tλ-T)1.07±0.01 is...