Hüvonen, D., Nagel, U., Rõõm, T., Choi, Y. J., Zhang, C. L., Park, S., ...
Magnetic excitations in cycloidal magnet LiCu$_2$O$_2$ are explored using THz absorption spectroscopy in magnetic fields up to 12 T. Below the spin ordering temperature we observe eight optically...
Interplay of Charge Order and Superconductivity in Two-Dimensional Organic Metals (2008)
Kaiser, S., Drichko, N., Rõõm, T., Hüvonen, D., Nagel, U., Greco, A., ...
The origin of superconductivity in the two-dimensional salt $\beta^{\prime\prime}$-(BEDT-TTF)$_2$SF$_5$CH$_2$CF$_2$SO$_3$, which has a quarter-filled conduction band, was investigated by infrared and...
Rotor in a Cage: Infrared Spectroscopy of an Endohedral Hydrogen-Fullerene Complex (2008)
Mamone, S., Ge, Min, Hüvonen, D., Nagel, U., Danquigny, A., Cuda, F., ...
We report the observation of quantized translational and rotational motion of molecular hydrogen inside the cages of C60. Narrow infrared absorption lines at the temperature of 6K correspond to...
Yang, J., Huvonen, D., Nagel, U., Room, T., Ni, N., Canfield, P. C., ...
Optical spectroscopy on single crystals of the new iron arsenide superconductor Ba{0.55}K{0.45}Fe2As2 shows that the infrared spectrum consists of two major components: a strong metallic Drude band...
Far-infrared signature of the superconducting gap in intercalated graphite CaC6 (2008)
Nagel, U., Huvonen, D., Joon, E., Kim, J. S., Kremer, R. K., Room, T.
Terahertz reflectance spectra of the Ca-intercalated graphite CaC6 reveal a superconducting gap below 11K. The gap signature lacks a sharp onset to full reflectivity at 2Delta, but rather shows a...
Magneto-optic far-infrared study of Sr$_{14}$Cu$_{24}$O$_{41}$: triplet excitations in chains (2007)
Hüvonen, D., Nagel, U., Rõõm, T., Haas, P., Dressel, M., ...
Using far-infrared spectroscopy we have studied the magnetic field and temperature dependence of the spin gap modes in the chains of Sr$_{14}$Cu$_{24}$O$_{41}$. Two triplet modes T$_1$ and T$_2$ were...
Fracture Processes Observed with A Cryogenic Detector (2006)
Astrom, J., Proebst, F., Stodolsky, L., Timonen, J., Bucci, C., ...
In the early stages of running of the CRESST dark matter search using sapphire detectors at very low temperature, an unexpectedly high rate of signal pulses appeared. Their origin was finally traced...
Fracture Processes Observed with A Cryogenic Detector (2006)
Astrom, J., Proebst, F., Stodolsky, L., Timonen, J., Bucci, C., ...
In the early stages of running of the CRESST dark matter search using sapphire detectors at very low temperature, an unexpectedly high rate of signal pulses appeared. Their origin was finally traced...
Fracture processes studied in CRESST (2006)
Angström, J., Pröbst, F., Stodolsky, L., Timonen, J., Bucci, C., ...
In the early stages of running of the CRESST dark matter search with sapphire crystals as detectors, an unexpectedly high rate of signal pulses appeared. Their origin was finally traced to fracture...
Fracture Processes Oberved with A Cryogenic Detector (2006)
Astrom, J., Stodolsky, F. Proebst. L., Timonen, J., Bucci, C., Cooper, S., Cozzini, C., ...
In the early stages of running of the CRESST dark matter search using sapphire detectors at very low temperature, an unexpectedly high rate of signal pulses appeared. Their origin was finally traced...
Fracture Processes Observed with A Cryogenic Detector (2005)
Astrom, J., Proebst, F., Stodolsky, L., Timonen, J., Bucci, C., ...
In the early stages of running of the CRESST dark matter search using sapphire detectors at very low temperature, an unexpectedly high rate of signal pulses appeared. Their origin was finally traced...
A tetrahedral curve is a space curve whose defining ideal is an intersection of powers of monomial prime ideals of height two. It is supported on a tetrahedral configuration of lines. Schwartau...
Rõõm, T., Hüvonen, D., Nagel, U., Hwang, J., Timusk, T.
We have studied spin excitation spectra in the Shastry-Sutherland model compound SrCu$_2$(BO$_3$)$_2$ in magnetic fields using far-infrared Fourier spectroscopy. The transitions from the ground...
Rõõm, T., Hüvonen, D., Nagel, U., Kremer, R. K.
We have studied far infrared transmission spectra of alpha'-NaV2O5 between 3 and 200cm-1 in polarizations of incident light parallel to a, b, and c crystallographic axes in magnetic fields up to 33T....
Rõõm, T., Huvonen, D., Nagel, U., Wang, Y. J., Kremer, R. K.
We have studied far-infrared transmission spectra of alpha(')-NaV2O5 between 3 and 200 cm(-1) in polarizations of incident light parallel to a, b, and c crystallographic axes in magnetic fields up to...
Automatische Positionierung von Elementen einer Topic Map (2004)
In der vorgestellten Studienarbeit soll die, bei der Visualisierung von Topic Maps nötige, automatische Positionierung der Topics untersucht werden. Topic Maps sind Wissenskarten, die rund um...
The Weak and Strong Lefschetz Properties for Artinian K-Algebras (2002)
Harima, T., Migliore, J., Nagel, U., Watanabe, J.
Let A = bigoplus_{i >= 0} A_i be a standard graded Artinian K-algebra, where char K = 0. Then A has the Weak Lefschetz property if there is an element ell of degree 1 such that the multiplication...
Liaison and Related Topics: Notes from the Torino Workshop/School (2002)
These are the expanded and detailed notes of the lectures given by the authors during the school and workshop entitled "Liaison and Related Topics," held at the Politecnico di Torino during the...
Limits on WIMP dark matter using sapphire cryogenic detectors (2002)
Anghoher, G., Bruckmayer, M., Bucci, C., Buehler, M., Cooper, S., Cozzini, C., ...
Limits on WIMP dark matter using sapphire cryogenic detectors (2002)
Anghoher, G., Bruckmayer, M., Bucci, C., Buehler, M., Cooper, S., Cozzini, C., ...
Limits on WIMP Dark Matter using Sapphire Cryogenic Detectors (2002)
Angloher,G., Bruckmayer,M., Bucci,C., Bühler,M., Cooper,S., Cozzini,C., ...
Data taken by CRESST with a cryogenic detector system based on 262 g sapphire crystals has been used to place limits on WIMP dark matter in the Galactic Halo. The experiment was especially sensitive...
Limits on WIMP Dark Matter using Sapphire Cryogenic Detectors (2002)
Angloher, G., Bruckmayer, M., Bucci, C., Bühler, M., Cooper, S., Cozzini, C., ...
Data taken by CRESST with a cryogenic detector system based on 262 g sapphire crystals has been used to place limits on WIMP dark matter in the Galactic Halo. The experiment was especially sensitive...
Far infrared study of the two dimensional dimer spin system SrCu_2(BO_3)_2 (1999)
Room, T., Nagel, U., Lippmaa, E., Kageyama, H., Onizuka, K., Ueda, Y.
Using far-infrared spectroscopy in magnetic fields up to 12T we have studied a two-dimensional dimer spin gap system SrCu_2(BO_3)_2. We found several infrared active modes in the dimerized state...
Bezout's theorem and Cohen-Macaulay modules (1999)
Migliore, J., Nagel, U., Peterson, C.
We define very proper intersections of modules and projective subschemes. It turns out that equidimensional locally Cohen-Macaulay modules intersect very properly if and only if they intersect...
Determinantal schemes and Buchsbaum-Rim sheaves (1997)
Kreuzer, M., Migliore, J. C., Nagel, U., Peterson, C.
Let $\phi$ be a generically surjective morphism between direct sums of line bundles on $\proj{n}$ and assume that the degeneracy locus, $X$, of $\phi$ has the expected codimension. We call $B_{\phi}...
Buchsbaum-Rim sheaves and their multiple sections (1997)
Migliore, J. C., Nagel, U., Peterson, C.
This paper begins by introducing and characterizing Buchsbaum-Rim sheaves on $Z = \Proj R$ where $R$ is a graded Gorenstein K-algebra. They are reflexive sheaves arising as the sheafification of...
Cryogenic particle detectors with superconducting phase transition thermometers (1996)
Ferger, P, Colling, P, Bucci, C, Nucciotti, A, Bühler, M, Cooper, S, ...
Progress on fabrication of iridium-gold proximity-effect thermometers (1996)
Höhne, J, Forster, G, Absmaier, C, Colling, P, Cooper, S, Von Feilitzsch, F, ...
Status and low background considerations for the CRESST dark matter search (1996)
Bühler, M, Zerle, L, Pröbst, F, Rulofs, A, Schanda, U, Seidel, W, ...
Status of CRESST Dark Matter Search (1996)
S. Cooper, N. E. Booth, C. Bucci, M. Buhler, K. Djotni, F.v. Feilitzsch, ...
We are preparing the CRESST (Cryogenic Rare Event Search with Superconducting Thermometers) experiment to search for dark matter WIMPs using cryogenic detectors. Our experiment is complementary to...