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

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

1997-01-19

arxiv.org/abs/cond-mat/9701130v1

Phys. Rev. B 55,15146 (1997)

Physics

Condensed Matter

Superconductivity

18 pages (12pt) RevTeX, 4 postscript figures

Scientific paper

10.1103/PhysRevB.55.15146

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.

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