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Pis'ma v Zh. Èksper. Teoret. Fiz., 2018, Volume 107, Issue 1, Pages 47–53 (Mi jetpl5465)  

This article is cited in 1 scientific paper (total in 1 paper)

CONDENSED MATTER

Structure and anisotropy of the superconducting order parameter in Ba$_{0.65}$K$_{0.35}$Fe$_2$As$_2$ probed by Andreev spectroscopy

T. E. Kuzmichevaa, S. A. Kuzmichevab, A. A. Kordyukc, V. M. Pudalovad

a Lebedev Physical Institute, Russian Academy of Sciences, Moscow, Russia
b Moscow State University, Moscow, Russia
c Kurdyumov Institute for Metal Physics, National Academy of Sciences of Ukraine, Kyiv, Ukraine
d National Research University Higher School of Economics, Moscow, Russia

Abstract: The superconducting order parameters in optimally doped Ba$_{0.65}$K$_{0.35}$Fe$_2$As$_2$ single crystals have been directly measured using multiple Andreev reflection effect spectroscopy of superconductornormal metalsuperconductor break-junctions. We determine two superconducting gaps, which are nodeless in the $k_xk_y$-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 $\Delta_{\mathrm{L}}$ develops, a weak coupling in the condensate with the small gap $\Delta_S$, 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).

Funding Agency Grant Number
Ministry of Education and Science of the Russian Federation MK-5699.2016.2
Russian Foundation for Basic Research 15-03-99628_
Russian Science Foundation 16-42-01100


DOI: https://doi.org/10.7868/S0370274X18010095

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English version:
Journal of Experimental and Theoretical Physics Letters, 2018, 107:1, 42–47

Bibliographic databases:

Received: 02.11.2017
Revised: 16.11.2017

Citation: T. E. Kuzmicheva, S. A. Kuzmichev, A. A. Kordyuk, V. M. Pudalov, “Structure and anisotropy of the superconducting order parameter in Ba$_{0.65}$K$_{0.35}$Fe$_2$As$_2$ probed by Andreev spectroscopy”, Pis'ma v Zh. Èksper. Teoret. Fiz., 107:1 (2018), 47–53; JETP Letters, 107:1 (2018), 42–47

Citation in format AMSBIB
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\paper Structure and anisotropy of the superconducting order parameter in Ba$_{0.65}$K$_{0.35}$Fe$_2$As$_2$ probed by Andreev spectroscopy
\jour Pis'ma v Zh. \`Eksper. Teoret. Fiz.
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\vol 107
\issue 1
\pages 47--53
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\crossref{https://doi.org/10.7868/S0370274X18010095}
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\jour JETP Letters
\yr 2018
\vol 107
\issue 1
\pages 42--47
\crossref{https://doi.org/10.1134/S002136401801006X}
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    This publication is cited in the following articles:
    1. T. E. Kuzmicheva, S. A. Kuzmichev, I. V. Morozov, S. Vurmel, B. Byukhner, Pisma v ZhETF, 111:6 (2020), 388–395  mathnet  crossref
  •       Pis'ma v Zhurnal ksperimental'noi i Teoreticheskoi Fiziki
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