Details of the disorder-induced transition between s(+/-) and s(++) states in the two-band model for Fe-based superconductors
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URI (для ссылок/цитирований):
http://stacks.iop.org/0953-2048/31/i=3/a=034001https://elib.sfu-kras.ru/handle/2311/111031
Автор:
Шестаков, В. А.
Коршунов, М. М.
Тогушова, Ю. Н.
Ефремов, Д. В.
Долгов, О. В.
Коллективный автор:
Институт инженерной физики и радиоэлектроники
Кафедра теоретической физики и волновых явлений
Дата:
2018-01Журнал:
SUPERCONDUCTOR SCIENCE & TECHNOLOGYКвартиль журнала в Scopus:
Q1Квартиль журнала в Web of Science:
Q1Библиографическое описание:
Шестаков, В. А. Details of the disorder-induced transition between s(+/-) and s(++) states in the two-band model for Fe-based superconductors [Текст] / В. А. Шестаков, М. М. Коршунов, Ю. Н. Тогушова, Д. В. Ефремов, О. В. Долгов // SUPERCONDUCTOR SCIENCE & TECHNOLOGY. — 2018. — Т. 31 (№ 3). — С. 034001--1-6Текст статьи не публикуется в открытом доступе в соответствии с политикой журнала.
Аннотация:
Irradiation of superconductors with different particles is one of many ways to investigate the effects of disorder. Here we study the disorder-induced transition between s(+/-) and s(++) states in the two-band model for Fe-based superconductors with nonmagnetic impurities. Specifically, we investigate the important question of whether the superconducting gaps during the transition change smoothly or abruptly. We show that the behavior can be of either type and is controlled by the ratio of intraband to interband impurity scattering potentials, and by a parameter sigma, that represents scattering strength and ranges from zero (Born approximation) to one (unitary limit). For the pure interband scattering potential and the scattering strength sigma less than or similar to 0.11, the s(+/-) -> s(++) transition is accompanied by steep changes in the gaps, while for larger values of s, the gaps change smoothly. The behavior of the gaps is characterized by steep changes at low temperatures, T < 0.1T(c0) with T-c0 being the critical temperature in the clean limit, otherwise it changes gradually. The critical temperature T-c is always a smooth function of the scattering rate in spite of the steep changes in the behavior of the gaps.