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Статья

Estimation of Intraband and Interband Relative Coupling Constants from Temperature Dependences of the Order Parameter for Two-Gap Superconductors

Journal of Superconductivity and Novel Magnetism. 2016. Vol. 29. No. 4. P. 1111-1116.
Kuzmichev S. A., Kuzmicheva T. E., Tchesnokov S., Pudalov V. M., Vasiliev A. N.

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 L,S(T ) are wellfitted with a two-gap model based on Moskalenko and Suhl system of equations (supplemented with a BCSintegral renormalization). From the fitting procedure, we
estimate the key attribute of superconducting state — relative electron-boson coupling constants and eigen BCSratios 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.