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

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

1998-02-04

arxiv.org/abs/cond-mat/9802055v1

Phys. Rev. Lett. 80, 5413 (1998)

Physics

Condensed Matter

Superconductivity

5 pages, ReVTEX

Scientific paper

10.1103/PhysRevLett.80.5413

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.

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