Abstract
For MgB2 where coexist two coupled superconductivity gaps a two-band scheme has been developed. Three interaction channels have been taken into account: a pair-transfer type σ-π-interband repulsion, a σ-intraband effective attraction of electron-phonon nature, and a σ-intraband Coulomb interaction. By means of simultaneous fitting of Tc, specific heat jump and zero-temperature gaps ratio the optimal values of interaction constants have been found. The Tc isotope effect exponent, the temperature dependencies of gaps and the thermodynamic characteristics (specific heat, Hc2) calculated agree with the experimental findings. The theoretical curve of Tc vs chemical potential reproduces qualitatively the influence of doping on superconductivity phase transition in MgB2.
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