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| Autori principali: | , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| Soggetti: | |
| Accesso online: | https://arxiv.org/abs/2509.19796 |
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| _version_ | 1866908556578521088 |
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| author | Shestakov, V. A. Korshunov, M. M. |
| author_facet | Shestakov, V. A. Korshunov, M. M. |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_19796 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Grand thermodynamic potential in a two-band unconventional superconductor Shestakov, V. A. Korshunov, M. M. Superconductivity 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. |
| title | Grand thermodynamic potential in a two-band unconventional superconductor |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2509.19796 |