Magnetic pair breaking in disordered superconducting films

Details Magnetic pair breaking in disordered superconducting films Magnetic pair breaking in disordered superconducting films

1995-08-22

arxiv.org/abs/cond-mat/9508094v2

Phys. Rev. B vol. 53, pp. 359-364 (1996)

Physics

Condensed Matter

Superconductivity

6 pp., REVTeX, epsf, 2 eps figs, final version as published

Scientific paper

10.1103/PhysRevB.53.359

A theory for the effects of nonmagnetic disorder on the magnetic pair breaking rate $\alpha$ induced by paramagnetic impurities in quasi two-dimensional superconductors is presented. Within the framework of a strong-coupling theory for disordered superconductors, we find that the disorder dependence of $\alpha$ is determined by the disorder enhancements of both the electron-phonon coupling and the spin-flip scattering rate. These two effects have a tendency to cancel each other. With parameter values appropriate for Pb_{0.9} Bi_{0.1}, we find a pair breaking rate that is very weakly dependent on disorder for sheet resistances 0 < R < 2.5 kOhm, in agreement with a recent experiment by Chervenak and Valles.

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