Effect of spatial variations of superconducting gap on suppression of the transition temperature by impurities

Abstract

We calculate correction to the critical temperature of a dirty superconductor, which results from the local variations of the gap function near impurity sites. This correction is of the order of T_c/E_F and becomes important for short-coherence length superconductors. It generally reduces a pair-breaking effect. In s-wave superconductors small amounts of nonmagnetic impurities can increase the transition temperature.

5 pages, ReVTEX

References in corpus (1)

• Local Electronic Structure of Defects in Superconductors

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