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- Title
Temperature-Dependent s± ↔ s++ Transitions in the Multiband Model for Fe-Based Superconductors with Impurities.
- Authors
Shestakov, V. A.; Korshunov, M. M.; Dolgov, O. V.
- 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 T c , and only the s + + state is left for higher amounts of disorder.
- Subjects
NONMAGNETIC steel; PHASE diagrams; LOW temperatures; SUPERCONDUCTING transition temperature; PHASE equilibrium
- Publication
Symmetry (20738994), 2018, Vol 10, Issue 8, p323
- ISSN
2073-8994
- Publication type
Article
- DOI
10.3390/sym10080323