Temperature-dependent s± ↔ s++ transitions in the multiband model for fe-based superconductors with impurities

Описание

Тип публикации: статья из журнала

Год издания: 2018

Идентификатор DOI: 10.3390/sym10080323

Аннотация: We study the dependence of the superconducting gaps on both the disorder and the temperature within the two-band model for iron-based materials. In the clean limit, the system is in the s± state with sign-changing gaps. Scattering by nonmagnetic impurities leads to the change of the sign of the smaller gap, resulting in a transition from the s± to the s++ state with the sign-preserving gaps. We show here that the transition is temperature-dependent. Thus, there is a line of s± → s++ transition in the temperature-disorder phase diagram. There is a narrow range of impurity scattering rates, where the disorder-induced s± → s++ transition occurs at low temperatures, but then the low-temperature s++ state transforms back to the s± state at higher temperatures. With increasing impurity scattering rate, the temperature of such s++ → s± transition shifts to the critical temperature Tc, and only the s++ state is left for higher amounts of disorder.

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Издание

Журнал: Symmetry

Выпуск журнала: Т.10, 8

Номера страниц: 323

ISSN журнала: 20738994

Авторы

  • Shestakov V.A. (Kirensky Institute of Physics,Federal Research Center KSC SB RAS)
  • Korshunov M.M. (Kirensky Institute of Physics,Federal Research Center KSC SB RAS)
  • Dolgov O.V. (P.N. Lebedev Physical Institute RAS)

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