Solutions of the Eliashberg equations with abnormally large values of 2?(0)/T C
作者： B. Barbiellini , M. Peter , M. Weger
DOI: 10.1007/BF00728426
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摘要: We consider the Eliashberg equations with an electron-phonon matrix elementg(k, k, q) possessing a low-energy cutoffξ1. In superconducting state, we assume that this cutoff is bound from below by gap 2Δ. solve for Δ andξ1 self-consistently, as function of temperature, and find ratio 2Δ(0)/Tc very large; parameters realistic cuprates, approximately 10. This calculation applies to materials where mean free path long (clean limit). also hysteretic behavior in principle possible.
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