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Symmetry 2018, 10(8), 323; https://doi.org/10.3390/sym10080323

Temperature-Dependent s±s++ Transitions in the Multiband Model for Fe-Based Superconductors with Impurities

1
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 660036 Krasnoyarsk, Russia
2
Donostia International Physics Center, 20018 Donostia-San Sebastian, Spain
3
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
(This article belongs to the Special Issue Gap Symmetry and Structure of Superconductors)
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Abstract

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. View Full-Text
Keywords: unconventional superconductors; iron pnictides; iron chalcogenides; impurity scattering unconventional superconductors; iron pnictides; iron chalcogenides; impurity scattering
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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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.

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