Abstract
AbstractThe theoretical formula of McMillan, modified via the multiple‐scattering theory by Gomersall and Gyorffy, has been very successful in computing the electron—phonon coupling constant (λ) and the transition temperature (Tc) of many superconducting elements and compounds. For disordered solids, such as substitutional alloys, however, this theory fails because of the breakdown of the translational symmetry used in the multiple‐scattering theory. Under these conditions the problem can still be solved if the t‐matrix is averaged in the random phase approximation (average T‐matrix approximation). Gomersall and Gyorffy's expression is reformulated for λ in the random phase approximation. This theory is applied to calculate λ and Tc of the binary substitutional NbMo alloy system at different concentrations. The results appear to be in fair agreement with experiments.
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