Estimation of intraband and interband relative coupling constants from temperature dependences of the order parameter for two-gap superconductorsстатья
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Аннотация:We present temperature dependences of the large and the small superconducting gaps measured directly by SnS-Andreev spectroscopy in various Fe-based superconductors and MgB2. The experimental $\Delta_{L,S}(T)$ are well-fitted by a two-gap model based on Moskalenko and Suhl system of equations (extended by a BCS-integral renormalization). Under the fitting procedure, we estimate the most important attribute of superconducting state -- relative electron-boson coupling constants and eigen BCS-ratios for both condensates. We show a driving role of a strong intraband coupling in the bands with the large gap and rather weak interband coupling in all the superconductors under study.
keywords: High-temperature superconductors; Two-gap superconductivity; Iron Pnictides; MgB2; Andreev spectroscopy; MARE spectroscopy
PACS: 74.25.-q, 74.45.+c, 74.70.Xa