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Multiple Andreev Reflection Spectroscopy of Optimally Doped Ba(Fe, Ni)2As2 Superconducting Pnictides

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Abstract

The current-voltage characteristics and dynamic conductance spectra of the SnS junction in Ba(Fe, Ni)2As2 superconducting pnictide of almost optimal composition have been obtained. A slight slope of the electronic density of states near the Fermi level has been detected. Using multiple Andreev reflection spectroscopy, we have directly determined the values and the temperature dependences of the two superconducting order parameters and estimated their anisotropy. We have shown that the obtained temperature dependences of Andreev excess current and Andreev zero-bias conductance could be fitted with a two-band model, and estimated the partial conductances of the two effective bands where the large and the small gaps are developed.

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Acknowledgments

We are grateful to Yu.A. Aleschenko, A.V. Muratov, and V.M. Pudalov for fruitful discussions. The measurements were partly performed using the equipment of the Shared Facility Center at the Lebedev Physical Institute.

Funding

The Andreev spectroscopy measurements were supported by the Russian Science Foundation (project no. 19-72-00196); crystal growth and characterization of the used single crystals were supported by the Russian Foundation for Basic Research (project no. 19-02-00888).

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Authors and Affiliations

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

    T. E. Kuzmicheva, S. A. Kuzmichev, K. S. Pervakov & V. A. Vlasenko

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

    S. A. Kuzmichev

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  1. T. E. Kuzmicheva
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Correspondence to T. E. Kuzmicheva.

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Russian Text © The Author(s), 2020, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2020, Vol. 112, No. 12, pp. 822–829.

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Kuzmicheva, T.E., Kuzmichev, S.A., Pervakov, K.S. et al. Multiple Andreev Reflection Spectroscopy of Optimally Doped Ba(Fe, Ni)2As2 Superconducting Pnictides. Jetp Lett. 112, 786–792 (2020). https://doi.org/10.1134/S0021364020240066

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