Effect of ordering of Anderson impurities on the critical temperature of a superconductor

The linearized equation of Gor’kov is used to obtain an equation for the superconducting transition temperature of a superconductor with a small concentration of Anderson impurities distributed in an ordered fashion, in the nonmagnetic case. It is shown that there exists a critical impurity concentration at which the temperature of the superconducting transition of a superconductor with an ordered distribution of impurities begins to exceed that of the pure superconductor.

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