Enhancement of the upper critical field of MgB2 by carbon-doping |
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| Authors: | Xiaosheng Huang William Mickelson B.Christopher Regan Alex Zettl |
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| Affiliation: | Department of Physics, University of California at Berkeley, and Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA |
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| Abstract: | We have measured the temperature dependence of the upper critical field, Hc2(T), of carbon-doped MgB2. Hc2(T) does not follow the well-known Werthamer-Helfand-Hohenberg (WHH) result for a one-gap dirty superconductor but can be described well by the result of a recent theoretical calculation for a two-gap dirty superconductor. Hc2(0) of the carbon-doped material is determined to be between 29 and 38 T, substantially higher than that of pure MgB2 (15-23 T). |
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| Keywords: | 74.70.Ad 74.25.Ha |
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