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

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Abstract

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 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.

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Acknowledgments

We thank Ya.G. Ponomarev, A. Charnukha for useful discussions, N.D. Zhigadlo, T. Hänke, C. Hess, B. Behr, R. Klingeler, S. Wurmehl, B. Büchner, I.V. Morozov, S.I. Krasnosvobodtsev, E.P. Khlybov, L.F. Kulikova, A.V. Sadakov, B.M. Bulychev, L.G. Sevast’yanova, K.P. Burdina, V.K. Gentchel for samples synthesis and characterization. This work was supported by RFBR Grants 13-02-01451 and 14-02-90425.

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Authors and Affiliations

  1. Physics Faculty, M.V. Lomonosov Moscow State University, Moscow, 119991, Russia

    S. A. Kuzmichev, S. N. Tchesnokov & A. N. Vasiliev

  2. P.N. Lebedev Physical Institute of RAS, Moscow, 119991, Russia

    T. E. Kuzmicheva & V. M. Pudalov

  3. Theoretical Physics and Applied Mathematics Department, Ural Federal University, 620002, Ekaterinburg, Russia

    A. N. Vasiliev

  4. National University of Science and Technology “MISiS”, Moscow, 119049, Russia

    A. N. Vasiliev

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  1. S. A. Kuzmichev
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  2. T. E. Kuzmicheva
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  3. S. N. Tchesnokov
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  4. V. M. Pudalov
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  5. A. N. Vasiliev
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Correspondence to S. A. Kuzmichev.

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Kuzmichev, S.A., Kuzmicheva, T.E., Tchesnokov, S.N. et al. Estimation of Intraband and Interband Relative Coupling Constants from Temperature Dependences of the Order Parameter for Two-Gap Superconductors. J Supercond Nov Magn 29, 1111–1116 (2016). https://doi.org/10.1007/s10948-016-3386-5

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  • DOI: https://doi.org/10.1007/s10948-016-3386-5

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