Disorder-induced transition between $s$± and $s$++ states in two-band superconductors

Efremov, D. V.; Korshunov, M. M.; Dolgov, O. V.; Golubov, A. A.; Hirschfeld, P. J.

doi:10.1103/physrevb.84.180512

Disorder-induced transition between $$s$$_± and $$s$$₊₊ states in two-band superconductors

Journal Article · Wed Nov 16 00:00:00 EST 2011 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/physrevb.84.180512· OSTI ID:2484136

Efremov, D. V. ^[1]; Korshunov, M. M. ^[2]; Dolgov, O. V. ^[1]; Golubov, A. A. ^[3]; Hirschfeld, P. J. ^[4]

Max-Planck-Institut für Festkörperforschung, Stuttgart (Germany)
University of Florida, Gainesville, FL (United States); Siberian Branch of Russian Academy of Sciences, Krasnoyarsk (Russia); Siberian Federal University, Krasnoyarsk (Russia)
University of Twente, Enschede (The Netherlands)
University of Florida, Gainesville, FL (United States)

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_± state to a gapless and then to a fully gapped s₊₊ state, controlled by a single parameter—the sign of the average coupling constant <λ>. As a result, we argue that this transition has strong implications for experiments.

View Accepted Manuscript (DOE)

Research Organization:: University of Florida, Gainesville, FL (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: FG02-05ER46236

OSTI ID:: 2484136

Alternate ID(s):: OSTI ID: 1101186

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 18 Vol. 84; ISSN 1098-0121

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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