Group expansions for impurities in superconductors
Yu. G. Pogorelov, V. M. Loktev
DOI 10.1103/PhysRevB.69.214508 · Physical Review B
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Abstract
A method is proposed for practical calculation of the effective interaction between impurity scatterers in superconductors, based on algebraic properties of related Nambu matrices for Green functions. In particular, we show that the density of states within the s-wave gap can have a nonzero contribution (impossible either in Born or in T-matrix approximation) from nonmagnetic impurities with concentration c≪1, beginning from ∼c3 order.
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