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Andreev Spectroscopy of EuCsFe4As4 Stoichiometric Superconducting Pnictideстатья
- Авторы: Kuzmichev S.A., Pervakov K.S., Vlasenko V.A., Degtyarenko A.Yu, Gavrilkin S.Yu, Kuzmicheva T.E.
- Журнал: JETP Letters
- Том: 116
- Год издания: 2022
- Издательство: Maik Nauka/Interperiodica Publishing
- Местоположение издательства: Russian Federation
- Первая страница: 723
- Последняя страница: 728
- DOI: 10.1134/s0021364022602329
- Аннотация: EuCsFe4As4 pnictide (1144 family) single crystals with a critical temperature of Tc ≈ 36.8 K and optimal superconducting properties in the stoichiometric composition are grown. Multiple-gap superconductivity determined by bulk order parameters Δ_{L^out}, Δ_{L^in}, and Δ_S with characteristic ratios 2Δ_{L^out}(0)/kTc ≈ 5.3, 2Δ_{L^in}(0)/kTc ≈ 3.2, and 2Δ_S(0)/kTc ≈ 1.3, respectively, is found for the first time below Tc using incoherent multiple Andreev reflection effect (IMARE) spectroscopy. It is shown that the gap structure of EuCsFe4As4 is similar to that of BaFe(2–x)Ni(x)As2 superconducting pnictides of the sister 122 family.
- Добавил в систему: Кузьмичев Светослав Александрович