Effect of magnetic and non-magnetic impurities on highly anisotropic superconductivity

Abstract

We generalize Abrikosov-Gor'kov solution of the problem of weakly coupled superconductor with impurities on the case of a multiband superconductor with arbitrary interband order parameter anisotropy, including interband sign reversal of the order parameter. The solution is given in terms of the effective (renormalized) coupling matrix and describes not only $T_c$ suppression but also renormalization of the superconducting gap basically at all temperatures. In many limiting cases we find analytical solutions for the critical temperature suppression. We illustrate our results by numerical calculations for two-band model systems.

18 pages (12pt) RevTeX, 4 postscript figures

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• Predictions for Impurity-Induced Tc Suppression in the High-Temperature Superconductors
• Sign reversal of the order parameter in s-wave superconductors
• Energy Gap Induced by Impurity Scattering: New Phase Transition in Anisotropic Superconductors

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