The Green's functions of s- and d-electrons in superconductors are obtained on the basis of the interpolation theory, which includes as impurity effects the pair breaking and the effective repulsive interaction between s-electrons. By the use of these Green's functions, the order parameter and the critical magnetic field at zero temperature in the presence of impurities and its initial decrease are given. The localized excited state in the gap is found and shown to be doublet, differently from that of Muller-Hartmann and Zittartz.
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Taeko Matsuura (1977) studied this question.
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