5 papers · 1 filter
Improved Hc2 in Bulk-Form Magnesium Diboride by Mechanical Alloying With Carbon
B. J. Senkowicz, J. E. Giencke, S. Patnaik +3
High energy milling of MgB2 pre-reacted powder renders the material largely amorphous through extreme mechanical deformation and is suitable for mechanically alloying MgB2 with dop…
Thermally-activated current transport in MgB_2 films
S. Patnaik, A. Gurevich, S. D. Bu +3
Thermally-activated flux flow (TAFF) resistivity above the irreversibility field is reported for two different c-axis textured MgB_2 superconducting films. Transport measurements a…
High-field superconductivity in alloyed MgB2 thin films
V. Braccini, A. Gurevich, J. E. Giencke +24
We investigated the effect of alloying on the upper critical field in 12 films, in which disorder was introduced by growth, carbon doping or He-ion irradiation, fi…
Very high upper critical fields in MgB2 produced by selective tuning of impurity scattering
A. Gurevich, S. Patnaik, V. Braccini +16
We report a significant enhancement of the upper critical field of different samples alloyed with nonmagnetic impurities. By studying films and bulk polycrystals w…
MgB2 Energy Gap Determination by Scanning Tunneling Spectroscopy
T. W. Heitmann, S. D. Bu, D. M. Kim +13
We report scanning tunneling spectroscopy (STS) measurements of the gap properties of both ceramic MgB2 and c-axis oriented epitaxial MgB2 thin films. Both show a temperature depen…