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Single-Gap Superconductivity of (K0.8Na0.2)0.9Fe1.7Se2 and K0.8Fe1.7(Se0.73S0.27)2 Selenides Determined using Multiple Andreev Reflection Effect Spectroscopy
Russian version
Kuzmicheva T. E. 1, Kuzmichev S. A. 2,1, Ilina A. D.1, Nikitchenkov I. A.2,1, Shilov A. I.1, Rakhmanov E. O.3,1, Morozov I. V.3
1Lebedev Physical Institute, Russian Academy of Sciences, Moscow, Russia
2Moscow State University, Moscow, Russia
3Department of Chemistry, Lomonosov Moscow State University, Moscow, Russia
Email: kuzmichevate@lebedev.ru
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We have comprehensively studied the structure of the superconducting order parameter of (K0.8Na0.2)0.9Fe1.7Se2 and K0.8Fe1.7(S0.73Se0.27)2 iron selenides with critical temperatures Tc~ 27-31 K. Using incoherent multiple Andreev reflection effect spectroscopy of planar "break-junctions", in both compounds a development of a single-gap superconductivity and a bulk nature of the observed superconducting gap were shown, its magnitude and temperature dependence have been determined. The characteristic ratio 2Δ (0)/kBTc~ 4.1-4.6 obtained is almost similar for both compounds and points to a strong coupling in the electron bands. Keywords: high-temperature superconductivity, iron-based superconductors, tunneling spectroscopy, multiple Andreev reflections, superconducting order parameter.
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