“School of Nano-Sciences”
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| Paper IPM / Nano-Sciences / 8238 |
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| Abstract: | |||||
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For a binary alloy s-wave superconductor in the Bardeen�Cooper�Schrieffer
regime (weakly attractive electron interaction), the superconducting critical temperature, Tc, is calculated within the coherent potential approximation as a function of the impurity concentration c and the random potentials εi for different band fillings. In contradiction to Anderson's theorem (AT), we find that Tc is dramatically sensitive to c and εi. Our results show that for low impurity concentrations and weak on-site energies εi, AT is valid, while in the strong scattering limit even for low impurity concentration, Tc is very small for the clean system and on increasing c it is completely suppressed; hence AT is violated in this regime.
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