Temperature Dependence of the Superconducting Order Parameter in Stoichiometric Alkali Metal-Based Pnictide EuCsFe4As4

Авторы: Kuzmicheva Tatiana, Pervakov Kirill, Vlasenko Vladimir, Degtyarenko Alena, Kuzmichev Svetoslav
Журнал: Journal of Superconductivity and Novel Magnetism
Том: 37
Номер: 2
Год издания: 2024
Издательство: Springer Verlag
Местоположение издательства: Germany
Первая страница: 379
Последняя страница: 388
DOI: 10.1007/s10948-023-06681-7
Аннотация: We present the study of the superconducting order parameter in single crystals of alkali metal EuCsFe4As4 pnictide belonging to the novel 1144 family, turning to the superconducting state in the stoichiometric composition at critical temperature Tc ≈ 37 K, and showing an antiferromagnetic ordering below Tc . In the superconducting state, using incoherent multiple Andreev reflection effect spectroscopy of superconductor-thin normal metal-superconductor (SnS) junctions, we show a multiple-gap superconductivity with possibly anisotropic large SC gap with an extended s-wave symmetry, and isotropic small SC gap. We directly determined the magnitudes, characteristic ratios, and temperature evolution of the superconducting gaps. The latter are found to be typical for a superconductor with rather weak interband interaction between SC condensates in the k-space.
Добавил в систему: Кузьмичев Светослав Александрович

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