1304.0113 (K. V. Grigorishin et al.)

Violation of Anderson's theorem for s-wave superconductor containing
impurities with retarded interaction    [PDF]

K. V. Grigorishin, B. I. Lev

A generalization of a disordered metal's theory has been proposed when scattering of quasi-particles by impurities is caused with a retarded interaction. It was shown that in this case Anderson's theorem was violated in the sense that introduction of the impurities in s-wave superconductor increases critical temperature. The increasing depends on parameters of metal, impurities and their concentration. At a specific relation between the parameters the critical temperature of the dirty superconductor can essentially exceed critical temperature of pure one. Thus the impurities catalyzes superconductivity in an originally low-temperature superconductor.

View original: http://arxiv.org/abs/1304.0113