Superconducting gap structure of slightly overdoped NaFe$$_{0.955}$$Co$$_{0.045}$$As pnictides: joint SnS-Andreev spectroscopy and specific heat study

Авторы: Kuzmichev Svetoslav, Muratov Andrei, Gavrilkin Sergey, Morozov Igor, Shilov Andrey, Rakhmanov Yevgeny, Degtyarenko Alena, Kuzmicheva Tatiana
Журнал: European Physical Journal Plus
Том: 139
Номер: 1
Год издания: 2024
Номер статьи: 74
DOI: 10.1140/epjp/s13360-024-04879-9
Аннотация: We present a study of the superconducting order parameter in slightly overdoped alkali-metal-based pnictides NaFe0.955Co0.045As with Tc ≈ 21 K using a combination of incoherent multiple Andreev reflection effect (IMARE) spectroscopy of planar SnS-junctions and specific heat measurements. We observe a multiple-gap superconductivity, directly and locally determine the magnitudes Δ_i(0), characteristic ratios 2Δ_i(0)/kTc, and temperature dependences Δ_i(T) of the superconducting order parameters. Possible momentum dependence of the revealed gaps is discussed. We show that a usage of the characteristic ratios obtained in the IMARE experiment provides a qualitative fit of the extracted temperature dependence of the electronic specific heat C_el(T)/T within the two-band approach using only two free parameters.
Добавил в систему: Рахманов Евгений Олегович

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