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 transitioПоказать полностьюn 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.
Журнал: Symmetry
Выпуск журнала: Т. 10, № 8
Номера страниц: 323
ISSN журнала: 20738994