Temperature-Dependent s± ↔ s++ Transitions in the Multiband Model for Fe-Based Superconductors with Impurities
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 660036 Krasnoyarsk, Russia
Donostia International Physics Center, 20018 Donostia-San Sebastian, Spain
P.N. Lebedev Physical Institute RAS, 119991 Moscow, Russia
Author to whom correspondence should be addressed.
Received: 30 June 2018 / Revised: 1 August 2018 / Accepted: 3 August 2018 / Published: 6 August 2018
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
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
state with the sign-preserving gaps. We show here that the transition is temperature-dependent. Thus, there is a line of
transition in the temperature–disorder phase diagram. There is a narrow range of impurity scattering rates, where the disorder-induced
transition occurs at low temperatures, but then the low-temperature
state transforms back to the
state at higher temperatures. With increasing impurity scattering rate, the temperature of such
transition shifts to the critical temperature
, and only the
state is left for higher amounts of disorder.
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Shestakov, V.A.; Korshunov, M.M.; Dolgov, O.V. Temperature-Dependent s± ↔ s++ Transitions in the Multiband Model for Fe-Based Superconductors with Impurities. Symmetry 2018, 10, 323.
Shestakov VA, Korshunov MM, Dolgov OV. Temperature-Dependent s± ↔ s++ Transitions in the Multiband Model for Fe-Based Superconductors with Impurities. Symmetry. 2018; 10(8):323.
Shestakov, V. A.; Korshunov, M. M.; Dolgov, O. V. 2018. "Temperature-Dependent s± ↔ s++ Transitions in the Multiband Model for Fe-Based Superconductors with Impurities." Symmetry 10, no. 8: 323.
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