Abstract
The superconducting properties of MgB 1.96C 0.04 have been investigated by the transverse-field muon spin rotation (TF-μSR) technique. The extracted temperature dependence of the μ + spin depolarization rate, σ at TF=0.6 T has been analyzed in terms of a two-gap model. Carbon doping affects the size of both superconducting gaps and the doping effect is more pronounced for the smaller gap, which is related to the 3D π-sheets of the Fermi surface. The ‘universal’ correlation between the superconducting transition temperature, T c and the effective Fermi temperature, T F (Uemura plot) is also discussed.
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