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Multiple-Band Andreev Transport in Optimally Doped Superconducting Oxypnictides

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Abstract

Using multiple Andreev reflections (MAR) effect spectroscopy of SnS junctions, we directly determine temperature dependences of the superconducting order parameters, excess Andreev current, and zero-bias conductance (ZBC) in polycrystalline samples of superconducting oxypnictides Sm0.7Th0.3OFeAs and NdO0.6H0.36FeA with almost optimal critical temperatures. It is shown that the results obtained are self-consistent and could be described in the framework of a two-band model. We estimate a dominating contribution 70–85% of the bands with the large gap to the total conductance.

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Acknowledgments

The measurements were partly done using the equipment of the Shared Facility Center, Lebedev Physical Institute.

Funding

This work was supported by the Ministry of Science and Higher Education of the Russian Federation (topic no. 0023-2019-0005 “Physics of High-Temperature Superconductors and Novel Quantum Materials”).

Author information

Authors and Affiliations

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

    T. E. Kuzmicheva & S. A. Kuzmichev

  2. Faculty of Physics, Moscow State University, Moscow, 119991, Russia

    S. A. Kuzmichev

  3. CrystMat Company, Zurich, CH-8046, Switzerland

    N. D. Zhigadlo

Authors
  1. T. E. Kuzmicheva
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  2. S. A. Kuzmichev
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  3. N. D. Zhigadlo
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Corresponding author

Correspondence to T. E. Kuzmicheva.

Additional information

Russian Text © The Author(s), 2020, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2020, Vol. 112, No. 8, pp. 523–530.

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Kuzmicheva, T.E., Kuzmichev, S.A. & Zhigadlo, N.D. Multiple-Band Andreev Transport in Optimally Doped Superconducting Oxypnictides. Jetp Lett. 112, 491–497 (2020). https://doi.org/10.1134/S0021364020200102

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  • DOI: https://doi.org/10.1134/S0021364020200102

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