Abstract
The (lowest order) Brillouin-Wigner perturbational expansion theory is adopted to describe the mixed-valence impurities in the BCS superconductor. Two substantial quantities characterizing the superconducting state, i.e. the reduced transition temperature T c / T c0 and the reduced specific heat jump Δ C/Δ C 0 are calculated numerically as a function of the impurity concentration x and the energy level difference E f between two 4 f configurations. A comparison with the experimental data of the Th 1− x Ce x and Th 1− x U x alloys is also included with a more reasonable fitting than Kaiser's theory.
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