Abstract
The superconducting critical fieldsH c and the critical temperaturesT c have been measured down to 0.05 K in a series of dilute alloys ofMoCo,MoFe, andMoMn. These systems haveT K /T c0 of 50, 0.3, and 15, respectively, whereT K is the Kondo temperature of the alloy andT c0 is the critical temperature of pure Mo. The critical fields atT=0 and the specific heat jump atT c have been estimated from the observedH c and compared with the theories of the magnetic impurity effect in superconductors. The behavior of these quantities and the density of states are found to depend strongly uponT K /T c0 in agreement with theory. From the results it is inferred that in the limit of largeT K the superconducting properties of a Kondo alloy would tend to those of the Abrikosov-Gor'kov theory.
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