High-field superconductivity in alloyed MgB 2 thin films

V. Braccini, A. Gurevich, J. E. Giencke, M. C. Jewell, C. B. Eom, D. C. Larbalestier, A. Pogrebnyakov, Y. Cui, B. T. Liu, Y. F. Hu, J. M. Redwing, Qi Li, X. X. Xi, Rakesh Singh, R. Gandikota, J. Kim, B. Wilkens, Nathan Newman, J. Rowell, B. MoecklyV. Ferrando, C. Tarantini, D. Marré, M. Putti, C. Ferdeghini, R. Vaglio, E. Haanappel

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245 Scopus citations


We investigated the effect of alloying on the upper critical field H c2 for 12 MgB 2 films, in which disorder was introduced by growth, carbon doping or He-ion irradiation, finding a significant H c2 enhancement in C-alloyed films, and an anomalous upward curvature of H c2(T). Record high values of H c2 (4.2) ≈ 35 T and H c2 (4.2) ≈ 51 T were observed perpendicular and parallel to the ab plane, respectively. The temperature dependence of H c2(T) is described well by a theory of dirty two-gap superconductivity. Extrapolation of the experimental data to T=0 suggests that H c2 (O) may approach the paramagnetic limit of ∼70 T.

Original languageEnglish (US)
Article number012504
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number1
StatePublished - Jan 2005

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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