Year: 2025
Type: preprint
Abstract: In a two-band system, both conventional sign-preserving $s_{++}$ and unconventional sign-changing $s_{\pm}$ superconducting state may appear at low temperatures. Moreover, they may transform from one to another due to the impurity scattering. To study the details of such a transition here we derive the expression for the Grand thermodynamic potential $Ω$ for a two-band model with nonmagnetic impurities considered in a $\mathcal{T}$-matrix approximation. For the iron-based materials within the multiband Eliashberg theory, we show that the $s_{\pm} \to s_{++}$ transition in the vicinity of the Born limit is a first order phase transition.
Source: arXiv (Cornell University)
Authors: Shestakov, V. A., Korshunov, M. M.
Language: English
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7083511062
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