Unique interplay between superconducting and ferromagnetic orders in EuRbFe4As4

Авторы: Stolyarov V.S., Casano A., Belyanchikov M.A., Astrakhantseva A.S., Grebenchuk S.Yu, Baranov D.S., Golovchanskiy I.A., Voloshenko I., Zhukova E.S., Gorshunov B.P., Muratov A.V., Dremov V.V., Vinnikov L.Ya, Roditchev D., Liu Y., Cao G.H., Dressel M., Uykur E.
Журнал: Physical Review B
Том: 98
Номер: 140506(R)
Год издания: 2018
Издательство: American Physical Society
Местоположение издательства: United States
DOI: 10.1103/PhysRevB.98.140506
Аннотация: Transport, magnetic, and optical investigations on EuRbFe4As4 single crystals evidence that the ferromagnetic ordering of the Eu2+ magnetic moments at Tm = 15 K, below the superconducting transition (Tc = 36 K), affects superconductivity in a weak but intriguing way. Upon cooling below Tm, the zero resistance state is preserved and the diamagnetic response is only slightly affected by the emerging ferromagnetism; a perfect diamagnetism is recovered at low temperatures. The infrared conductivity is strongly suppressed in the far-infrared region below Tc, associated with the opening of a complete superconducting gap at 2 = 10 meV. A gap smaller than the weak-coupling limit suggests strong orbital effects or, within a multiband superconductivity scenario, the existence of a larger yet unrevealed gap.
Добавил в систему: Столяров Василий Сергеевич

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