ANDREEV REFLECTION SPECTROSCOPY FeSe: ANALYSIS WITHIN THE FRAMEWORK OF A TWO-BAND MODEL

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Abstract

The Andreev reflection spectra sNS (V,T) = dI/dV (V,T) of Ag/FeSe point contacts were measured in the temperature range T = 4 – 14 K. Analysis of the spectra within the framework of a two-band model with order parameters of s-symmetry revealed two energy gaps Di (i = 1, 2) and allowed us to plot their dependences on temperature. Approximation of the Di(T ) dependencies by a two-band isotropic model in the “pure” limit showed that their description requires taking into account both intraband and interband interactions of superconducting condensates. Such a description corresponds to s- or s++-symmetry of the order parameter.

About the authors

V. A. Stepanov

Lebedev Physical Institute of the Russian Academy of Sciences

Email: stepanov@lebedev.ru
Russian Federation, 119991, Moscow

M. V. Golubkov

Lebedev Physical Institute of the Russian Academy of Sciences

Email: stepanov@lebedev.ru
Russian Federation, 119991, Moscow

A. V. Sadakov

Lebedev Physical Institute of the Russian Academy of Sciences

Email: stepanov@lebedev.ru
Russian Federation, 119991, Moscow

A. S. Usol'tsev

Lebedev Physical Institute of the Russian Academy of Sciences

Email: stepanov@lebedev.ru
Russian Federation, 119991, Moscow

D. A. Chareev

Korzhinsky Institute of Experimental Mineralogy of the Russian Academy of Sciences; Dubna State University; Institute of Physics and Technology, Ural Federal University

Author for correspondence.
Email: stepanov@lebedev.ru
Russian Federation, 142432, Chernogolovka, Moscow Region; 141982, Dubna, Moscow Region; 620002, Yekaterinburg

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