Abstract
The dependence of the superconducting transition temperature T c on Ce impurity concentration and the specific heat jump at T c as a function of T c are reported for the system ( La Ce)Sn 3. The experimental results are analyzed using a theory due to Kaiser concerning the effect on superconductivity of nonmagnetic localized resonant impurity states This analysis yields values for the intraatomic Coulomb repulsion parameter U eff and the Ce local density of states at the Fermi level N ℓ (E F). The results of low temperature normal state heat capacity and magnetic susceptibility measurements which give independent estimates of N ℓ (E F) are also reported. A large pressure dependence of the T c of ( La Ce)Sn 3 alloys was observed for pressures up to 20 kbar. This behavior is similar to that previously observed in several other superconducting matrix-Ce impurity systems in which the Ce solute 4f electron shell undergoes a continuous-pressure induced demagnetization.
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