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Structure and Anisotropy of the Superconducting Order Parameter in Ba0.65K0.35Fe2As2 Probed by Andreev Spectroscopy

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Abstract

The superconducting order parameters in optimally doped Ba0.65K0.35Fe2As2 single crystals have been directly measured using multiple Andreev reflection effect spectroscopy of superconductor–normal metal–superconductor break-junctions. We determine two superconducting gaps, which are nodeless in the k x k y -plane of the momentum space, and resolve a substantial in-plane anisotropy of the large gap. The temperature dependences of the gaps indicate a strong coupling within the bands where ΔL develops, a weak coupling in the condensate with the small gap ΔS, and a moderate interband interaction between the two condensates. The own critical temperatures of both condensates have been estimated (under the hypotherical assumption of zero interband interaction).

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Authors and Affiliations

  1. Lebedev Physical Institute, Russian Academy of Sciences, Moscow, 119991, Russia

    T. E. Kuzmicheva, S. A. Kuzmichev & V. M. Pudalov

  2. Moscow State University, Moscow, 119991, Russia

    S. A. Kuzmichev

  3. Kurdyumov Institute for Metal Physics, National Academy of Sciences of Ukraine, Kyiv, 03142, Ukraine

    A. A. Kordyuk

  4. National Research University Higher School of Economics, Moscow, 101000, Russia

    V. M. Pudalov

Authors
  1. T. E. Kuzmicheva
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  2. S. A. Kuzmichev
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  3. A. A. Kordyuk
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  4. V. M. Pudalov
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Correspondence to T. E. Kuzmicheva.

Additional information

Original Russian Text © T.E. Kuzmicheva, S.A. Kuzmichev, A.A. Kordyuk, V.M. Pudalov, 2018, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2018, Vol. 107, No. 1, pp. 47–53.

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Kuzmicheva, T.E., Kuzmichev, S.A., Kordyuk, A.A. et al. Structure and Anisotropy of the Superconducting Order Parameter in Ba0.65K0.35Fe2As2 Probed by Andreev Spectroscopy. Jetp Lett. 107, 42–47 (2018). https://doi.org/10.1134/S002136401801006X

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  • DOI: https://doi.org/10.1134/S002136401801006X

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