EFFECT OF MAGNETIC AND NONMAGNETIC IMPURITIES ON HIGHLY ANISOTROPIC SUPERCONDUCTIVITY

We generalize Abrikosov-Gor'kov solution of the problem of weakly coup led superconductors with impurities to the case of a multiband superco nductor 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 describe s not only T-c suppression but also renormalization of the superconduc ting gap basically at all temperatures. In many Limiting cases we find analytical solutions for the critical temperature suppression. We ill ustrate our results by numerical calculations for two-band model syste ms.