Study of the MgB2 grain size role in ex-situ multifilamentary wires with thin filaments (2009)
Malagoli, A., Braccini, V., Bernini, C., Romano, G., Vignolo, M., Ferdeghini, C., ...
The MgB2 superconductor has already demonstrated its applicative potential, in particular for DC applications such as MRI magnets, thanks to the low costs of the raw materials and to its simple...
Malagoli, A., Braccini, V., Tropeano, M., Vignolo, M., Bernini, C., Fanciulli, C., ...
Ex-situ Powder-In-Tube MgB2 tapes prepared with ball-milled, undoped powders showed a strong enhancement of the irreversibility field H*, the upper critical field Hc2 and the critical current density...
Malagoli, A, Tropeano, M, Cubeda, V, Bernini, C, Braccini, V, Fanciulli, C, ...
In DC and AC practical applications of MgB2 superconducting wires an important role is represented by the material sheath which has to provide, among other things, a suitable electrical and thermal...
Kaushik, S. D., Braccini, V., Patnaik, S.
The dissipative mechanism at low current density is compared in three different classes of superconductors. This is achieved by measurement of resistance as a function of temperature and magnetic...
Effects of neutron irradiation on polycrystalline Mg11B2 (2005)
Tarantini, C., Aebersold, H. U., Braccini, V., Celentano, G., Ferdeghini, C., Ferrando, V., ...
We studied the influence of the disorder introduced in polycrystalline MgB2 samples by neutron irradiation. To circumvent self shielding effects due to the strong interaction between thermal neutrons...
Enhanced flux pinning in neutron irradiated MgB2 (2005)
Pallecchi, I., Tarantini, C., Aebersold, H. U., Braccini, V., Fanciulli, C., Ferdeghini, C., ...
We study the effect of neutron irradiation on the critical current density Jc of isotopically pure polycrystalline Mg11B2 samples. For fluences in the range 1017-1018 cm-2, Jc is enhanced and its...
High-field superconductivity in alloyed MgB2 thin films (2005)
Braccini, V., Gurevich, A., Giencke, J.E., Jewell, M.C., Eom, C.B., Larbalestier, D.C., ...
Critical field of magnesium diboride in substituted and irradiated samples (2005)
Tarantini, C., Braccini, V., Ferdeghini, C., Gatti, F., Manfrinetti, P., Marre, D., ...
Nanoscale-SiC doping for enhancing Jc and Hc2 in superconducting MgB2 (2004)
Dou, S. X., Braccini, V., Soltanian, S., Klie, R., Zhu, Y., Li, S., ...
The effect of nanoscale-SiC doping of MgB2 was investigated in comparison with undoped, clean-limit, and Mg-vapor-exposed samples using transport and magnetic measurements. It was found that there...
Nanoscale-SiC doping for enhancing Jc and Hc2 in superconducting MgB2 (2004)
Dou, S. X., Braccini, V., Soltanian, S., Klie, R., Zhu, Y., Li, S., ...
The effect of nanoscale-SiC doping of MgB2 was investigated in comparison with undoped, clean-limit, and Mg-vapor-exposed samples using transport and magnetic measurements. It was found that there...
Putti, M., Braccini, V., Ferdeghini, C., Gatti, F., Manfrinetti, P., Marre', D., ...
In this letter we present the effect of neutron irradiation up to fluences of 3.9 1019 n/cm2 on the superconducting properties of MgB2. In order to obtain a disorder structure homogeneously...
Very high upper critical fields in MgB2 produced by selective tuning of impurity scattering (2004)
Gurevich, A, Patnaik, S, Braccini, V, Kim, K. H., Mielke, C, Song, X, ...
We report a significant enhancement of the upper critical field Hc2 of different MgB2 samples alloyed with nonmagnetic impurities. By studying films and bulk polycrystals with different resistivities...
High-field superconductivity in alloyed MgB2 thin films (2004)
Braccini, V., Gurevich, A., Giencke, J. E., Jewell, M. C., Eom, C. B., Larbalestier, D. C., ...
We investigated the effect of alloying on the upper critical field $H_{c2}$ in 12 $MgB_2$ films, in which disorder was introduced by growth, carbon doping or He-ion irradiation, finding a significant...
Nanoscale-SiC doping for enhancing Jc and Hc2 in superconducting MgB2 (2004)
Dou, S.X., Braccini, V., Soltanian, S., Klie, R., Zhu, Y., Li, Shuang, ...
This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying...
Nanoscale-SiC doping for enhancing Jc and Hc2 in superconducting MgB2 (2004)
Dou, S. X., Braccini, V., Soltanian, S., Klie, R., Zhu, Y., Li, S., ...
The effect of nanoscale-SiC doping of MgB2 was investigated in comparison with undoped, clean-limit, and Mg-vapor-exposed samples using transport and magnetic measurements. It was found that there...
Nanoscale-SiC doping for enhancing Jc and Hc2 in superconducting MgB2 (2004)
Dou, S. X., Braccini, V., Soltanian, S., Klie, R., Zhu, Y., Li, S., ...
The effect of nanoscale-SiC doping of MgB2 was investigated in comparison with undoped, clean-limit, and Mg-vapor-exposed samples using transport and magnetic measurements. It was found that there...
Nanoscale-SiC doping for enhancing Jc and Hc2 in superconducting MgB2 (2004)
Dou, S. X., Braccini, V., Soltanian, S., Klie, R., Zhu, Y., Li, S., ...
The effect of nanoscale-SiC doping of MgB2 was investigated in comparison with undoped, clean-limit, and Mg-vapor-exposed samples using transport and magnetic measurements. It was found that there...
Critical Field of MGB2 : Crossover from Clean to Dirty Regimes (2003)
Putti, M., Braccini, V., Ferdeghini, C., Pallecchi, I., Siri, A. S., Gatti, F., ...
We have studied the upper critical field, Bc2, in poly-crystalline MgB2 samples in which disorder was varied in a controlled way to carry selectively p and s bands from clean to dirty limit. We have...
Nanoscale-SiC doping for enhancing Jc and Hc2 in the Superconducting MgB2 (2003)
Dou, S. X., Braccini, V., Soltanian, S., Klie, R., Zhu, Y., Li, S., ...
The effect of nanoscale-SiC doping of MgB2 was investigated using transport and magnetic measurements. It was found that there is a clear correlation between the critical temperature Tc, the...
Very high upper critical fields in MgB2 produced by selective tuning of impurity scattering (2003)
Gurevich, A., Patnaik, S., Braccini, V., Kim, K. H., Mielke, C., Song, X., ...
We report a significant enhancement of the upper critical field $H_{c2}$ of different $MgB_2$ samples alloyed with nonmagnetic impurities. By studying films and bulk polycrystals with different...
Thermal conductivity of MgB$_{2}$ in the superconducting state (2002)
Putti, M., Braccini, V., D'Agliano, E. Galleani, Napoli, F., Pallecchi, I., Siri, A. S., ...
We present thermal conductivity measurements on very pure and dense bulk samples, as indicated by residual resistivity values as low as 0.5 mW cm and thermal conductivity values higher than 200 W/mK....
Two-band effects in transport properties of MgB2 (2002)
Putti, M., Braccini, V., Galleani, E., Napoli, F., Pallecchi, I., Siri, A. S., ...
We present resistivity and thermal conductivity measurements on bulk samples, prepared either by a standard method or by a one-step technique. The latter samples, due to their high density and...
Significant enhancement of irreversibility field in clean-limit bulk MgB2 (2002)
Braccini, V., Cooley, L. D., Patnaik, S., Manfrinetti, P., Palenzona, A., Siri, A. S., ...
Low resistivity ("clean") MgB2 bulk samples annealed in Mg vapor show an increase in upper critical field Hc2(T) and irreversibility field Hirr(T) by a factor of 2 in both transport and magnetic...
Angular dependence of magnetoresistivity in c-oriented MgB2 thin film (2002)
Ferdeghini, C., Braccini, V., Cimberle, M. R., Marre, D., Manfrinetti, P., Ferrando, V., ...
The anisotropy of MgB2 is still under debate: its value, strongly dependent on the sample and on the measuring method, ranges between 1.2 and 13. In this work we present our results on a MgB2...
Significant enhancement of irreversibility field in clean-limit bulk MgB2 (2002)
Braccini, V., Cooley, Lance D., Patnaik, S., Larbalestier, David C., Manfrinetti, P., Palenzona, A., ...
This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying...
Anisotropy in c-oriented MgB2 thin films grown by Pulsed Laser Deposition (2001)
Ferdeghini, C., Ferrando, V., Grassano, G., Ramadan, W., Bellingeri, E., Braccini, V., ...
The electronic anisotropy in MgB2, is still a not completely clear topic; high quality c-oriented films are suitable systems to investigate this property. In this work we present our results on MgB2...
Transport properties of c-oriented MgB2 thin films grown by Pulsed Laser Deposition (2001)
Ferdeghini, C., Ferrando, V., Grassano, G., Ramadan, W., Braccini, V., Putti, M., ...
The electronic anisotropy in MgB2, which arises from its layered crystal structure is not completely clear until now. High quality c-oriented films offer the opportunity of studying such property....
Ferdeghini, C., Ferrando, V., Grassano, G., Ramadan, W., Bellingeri, E., Braccini, V., ...
MgB2 thin films were deposited using Pulsed Laser Deposition (PLD) and ex-situ annealing in Mg atmosphere. The films presented critical temperatures up to 36K and turned out to be preferentially...
Large transport critical currents in unsintered MgB2 superconducting tapes (2001)
Grasso, G., Malagoli, A., Ferdeghini, C., Roncallo, S., Braccini, V., Cimberle, M. R., ...
The Powder-In-Tube process has been employed to fabricate tape-like conductors with a strong metallic sheath and based on the newly discovered MgB2 superconducting phase. Long superconducting tapes...