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Paper   IPM / Nano-Sciences / 8238
School of Nano Science
  Title:   The validity of Anderson's theorem for binary alloy s-wave superconductors in the Bardeen-Cooper-Schrieffer regime
1.  Rostam Moradian
2.  Hamzeh Mousavi
  Status:   Published
  Journal: Supercond. Sci. Technol.
  No.:  6
  Vol.:  19
  Year:  2006
  Pages:   449-453
  Publisher(s):   IOP Publishing Ltd
  Supported by:  IPM
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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