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Multiple-Band Quasiparticle Transport in Tunneling Junctions Based on Superconducting Stoichiometric CaKFe4As4 Pnictide
Russian version
Kuzmicheva T. E.1, Ilina A. D.1, Nikitchenkov I. A.2,1, Pervakov K. S.1, Vlasenko V. A.1, Medvedev A. S.1, Kuzmichev S. A.2,1
1Lebedev Physical Institute, Russian Academy of Sciences, Moscow, Russia
2Moscow State University, Moscow, Russia
Email: kuzmichev@mig.phys.msu.ru
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Using tunneling spectroscopy of planar "break-junctions" we show a multiple-gap superconductivity in CaKFe4As4 pnictides. We determine the magnitudes and temperature dependences of the microscopic superconducting order parameter Δi(T). The temperature dependences of the features caused by Andreev transport are obtained: Andreev excess current Iexc(T) and Andreev zero-bias conductance GZBCA(T). As well, the temperature dependence of the critical current Ic(T) is measured. Using data of Iexc(T), GZBCA(T), and Ic(T), we estimate the partial conductance of the two effective bands, and show the dominate contribution of the "driving" bands with the large superconducting gap to the total conductance. Keywords: high-temperature superconductivity, pnictides, tunneling spectroscopy, multiple Andreev reflections, superconducting order parameter.
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