COMMENT ON THE ANISOTROPIC IMPURITY SCATTERING IN SUPERCONDUCTORS

We discuss a case of a strong anisotropic impurity scattering within t he model introduced in a previous paper and clarify our former stateme nt about a possible enhancement of the critical temperature in this sc attering regime. We show that for the anisotropy of the impurity poten tial determined by the functions from the non-identity irreducible rep resentations of the crystal point group, the critical temperature decr eases with the impurity scattering rate, a fact which is consistent wi th a generally understood role of disorder in superconductors. (C) 199 8 Elsevier Science Ltd. All rights reserved.