Estimation of intraband and interband relative coupling constants from temperature dependences of the order parameter for two-gap superconductors

We present temperature dependences of the large and the small superconducting gaps measured directly by SnS-Andreev spectroscopy in various Fe-based superconductors and MgB\(_2\). The experimental \(\Delta_{L,S}(T)\) are well-fitted with a two-gap model based on Moskalenko and Suhl system of equatio...

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Veröffentlicht in:arXiv.org 2015-12
Hauptverfasser: Kuzmichev, S A, Kuzmicheva, T E, Tchesnokov, S N, Pudalov, V M, Vasiliev, A N
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Sprache:eng
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Zusammenfassung:We present temperature dependences of the large and the small superconducting gaps measured directly by SnS-Andreev spectroscopy in various Fe-based superconductors and MgB\(_2\). The experimental \(\Delta_{L,S}(T)\) are well-fitted with a two-gap model based on Moskalenko and Suhl system of equations (supplemented with a BCS-integral renormalization). From the the fitting procedure, we estimate the key attribute of superconducting state \textemdash relative electron-boson coupling constants and eigen BCS-ratios for both condensates. Our results evidence for a driving role of a strong intraband coupling in the bands with the large gap, whereas interband coupling is rather weak for all the superconductors under study.
ISSN:2331-8422
DOI:10.48550/arxiv.1512.05799