Abstract
The heat capacity anomaly at the transition to superconductivityof the layered superconductor MgB2 is compared tofirst-principles calculations with the Coulomb repulsion,µ*, as the only parameter which is fixed to give themeasured Tc. We solve the Eliashberg equations for both anisotropic one-band model and a two-band model with differentsuperconducting gaps on the π-band and σ-bandFermi surfaces.The agreement with experiments is considerably better for thetwo-band model than for the one-band model.
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