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Observation of bosonic resonances in GdO1−x F x FeAs by intrinsic multiple Andreev reflection effect spectroscopy

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Abstract

The current–voltage characteristics and dynamic conductance spectra of Andreev arrays in nearly optimal GdO1 − x F x FeAs superconductors with the critical temperature T c = 46–50 K have been studied. A reproducible fine structure that accompanies large gap features and caused by boson emission during the process of multiple Andreev reflections has been observed. At T = 4.2 K, the bosonic mode energy ε0 = (12 ± 2) meV has been obtained.

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Authors and Affiliations

  1. Moscow State University, Moscow, 119991, Russia

    S. A. Kuzmichev

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

    S. A. Kuzmichev & T. E. Kuzmicheva

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  1. S. A. Kuzmichev
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  2. T. E. Kuzmicheva
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Correspondence to T. E. Kuzmicheva.

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Original Russian Text © S.A. Kuzmichev, T.E. Kuzmicheva, 2017, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2017, Vol. 105, No. 10, pp. 631–636.

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Kuzmichev, S.A., Kuzmicheva, T.E. Observation of bosonic resonances in GdO1−x F x FeAs by intrinsic multiple Andreev reflection effect spectroscopy. Jetp Lett. 105, 671–676 (2017). https://doi.org/10.1134/S0021364017100083

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  • DOI: https://doi.org/10.1134/S0021364017100083

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