ANISOTROPIC S-WAVE SUPERCONDUCTORS CONTAINING TRANSITION-METAL IMPURITIES - HIGH T-K KONDO IMPURITIES

The effects of transition metal impurities whose magnetic behavior is that of high T-K Kondo impurities and of anisotropy on the T-c's of co nventional superconductors are studied within the framework of the str ong coupling Eliashberg formalism. The Matsuura-Ichinose-Nagaoka theor y is used to describe the high T-K Kondo impurities. It is shown that the strong coupling and anisotropy combine to change the magnitudes of the initial decrease in T-c due to the impurities and of the critical concentration at which the impurities completely suppress superconduc tivity in different ways. The value of the former is lowered while the value of the latter is raised.