THEORY OF DISORDERED UNCONVENTIONAL SUPERCONDUCTORS
Keles A., Spivak B.

Received: May 27, 2014

DOI: 10.7868/S0044451014120128

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In contrast to conventional s-wave superconductivity, unconventional (e. g., p- or d-wave) superconductivity is strongly suppressed even by relatively weak disorder. Upon approaching the superconductor-metal transition, the order parameter amplitude becomes increasingly inhomogeneous, leading to effective granularity and a phase ordering transition described by the Mattis model of spin glasses. One consequence of this is that at sufficiently low temperatures, between the clean unconventional superconducting and the diffusive metallic phases, there is necessarily an intermediate superconducting phase that exhibits s-wave symmetry on macroscopic scales. This article is dedicated to A. F. Andreev on the occasion of his 75th birthday