Abstract
The observed relationship between the magnetic spin susceptibility and the superconducting transition temperature for the fcc transition metals is analyzed in terms of the recent theory of Berk and Schrieffer for the effect of spin fluctuations on the pairing interaction. The results indicate that the decrease in the transition temperature and the increase in the susceptibility are intimately connected and are both basically caused by an increasing Coulomb repulsion. The band density of states is found to decrease on going from iridium to rhodium, platinum, and palladium in qualitative agreement with recent x-ray emission spectroscopy results of Claus and Ulmer. The theory allows one to estimate the size of the spin susceptibility in the superconducting alloys to within about 5%, from which one concludes that the decrease in the transition temperature past iridium should be even more rapid that is actually observed.
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