Abstract
Measurements of the specific heat of Mg11B2, from 1 to 50 K in magnetic fields to 9 T, are reported. The superconducting-state electron contribution is very different from that of other superconductors, but the general features are consistent with predictions for a two-gap superconductor, and a two-gap model based on BCS thermodynamics can quantitatively represent it. Parameters characterizing the gaps are in agreement with theoretical calculations. An unusually strong magnetic field dependence of the temperature-proportional term in the electron contribution to the vortex-state specific heat is another manifestation of the two gaps.
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