Disorder induced transition between s_+- and s_++ states in two-band superconductors

Details Disorder induced transition between s_+- and s_++ states in two-band superconductors Disorder induced transition between s_+- and s_++ states in two-band superconductors

2011-04-19

arxiv.org/abs/1104.3840v2

Phys. Rev. B 84, 180512(R) (2011)

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures; suppl. material: 3 pages, 2 figures; published version

Scientific paper

10.1103/PhysRevB.84.180512

We have reexamined the problem of disorder in two-band superconductors, and shown within the framework of the T-matrix approximation, that the suppression of T_c can be described by a single parameter depending on the intraband and interband impurity scattering rates. T_c is shown to be more robust against nonmagnetic impurities than would be predicted in the trivial extension of Abrikosov-Gor'kov theory. We find a disorder-induced transition from the s_{\pm} state to a gapless and then to a fully gapped s_{++} state, controlled by a single parameter -- the sign of the average coupling constant <\lambda> . We argue that this transition has strong implications for experiments.

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