This article is cited in 1 paper

CONDENSED MATTER

Multiple-band Andreev transport in optimally doped superconducting oxypnictides

T. E. Kuzmicheva^a, S. A. Kuzmichev^ab, N. D. Zhigadlo<sup>c

a</sup> Lebedev Physical Institute, Russian Academy of Sciences, Moscow, 119991 Russia
^b Faculty of Physics, Moscow State University, Moscow, 119991 Russia
^c CrystMat Company, Zurich, CH-8046 Switzerland

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 Sm$_{0.7}$Th$_{0.3O}$FeAs and NdO$_{0.6}$H$_{0.36}$FeA 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.

Received: 15.09.2020
Revised: 20.09.2020
Accepted: 20.09.2020

DOI: 10.31857/S1234567820200069

 English version: Journal of Experimental and Theoretical Physics Letters, 2020, 112:8, 491–497

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