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 Δ L , S ( T ) are well-fitted with a two-gap model based on Moskalenko and Suhl system of equations (suppl...

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Bibliographic Details
Published in:Journal of superconductivity and novel magnetism 2016-04, Vol.29 (4), p.1111-1116
Main Authors: Kuzmichev, S. A., Kuzmicheva, T. E., Tchesnokov, S. N., Pudalov, V. M., Vasiliev, A. N.
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Condensed Matter Physics
Magnetic Materials
Magnetism
Original Paper
Physics
Physics and Astronomy
Strongly Correlated Systems
Superconductivity
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Summary: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 Δ 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 fitting procedure, we estimate the key attribute of superconducting state — 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:1557-1939
1557-1947
DOI:10.1007/s10948-016-3386-5