|
ИСТИНА |
Войти в систему Регистрация |
ИПМех РАН |
||
Superconducting properties of sulfur-doped iron selenideстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Scopus,
Web of Science
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 9 июня 2015 г.
- Авторы: Abdel-Hafiez 290 M., Zhang Y.Y., Cao Z.Y., Duan C.G., Karapetrov G., Pudalov V.M., Sadakov A.V., Knyazev D.A., Romanova T.A., Vlasenko V.A., Chareev D.A., Volkova O.S., Vasiliev A.N.
- Журнал: Physical Review B
- Том: 91
- Год издания: 2015
- Издательство: American Physical Society
- Местоположение издательства: United States
- Первая страница: 165109
- DOI: 10.1103/PhysRevB.91.165109
- Аннотация: The recent discovery of high-temperature superconductivity in single-layer iron selenide has generatedsignificant experimental interest for optimizing the superconducting properties of iron-based superconductors through the lattice modification. For simulating the similar effect by changing the chemical composition due to S doping, we investigate the superconducting properties of high-quality single crystals of FeSe1−xSx (x = 0, 0.04, 0.09, and 0.11) using magnetization, resistivity, the London penetration depth, and low temperature specific heat measurements. We show that the introduction of S to FeSe enhances the superconducting transition temperature Tc, anisotropy, upper critical field Hc2, and critical current density Jc. The upper critical field Hc2(T ) and its anisotropy are strongly temperature dependent, indicating a multiband superconductivity in this system. Through the measurements and analysis of the London penetration depth λab(T ) and specific heat, we show clear evidence for strong coupling two-gap s-wave superconductivity. The temperature dependence of λab(T ) calculated from the lower critical field and electronic specific heat can be well described by using a two-band model with s-wave-like gaps. We find that a d wave and single-gap BCS theory under the weak-coupling approach cannot describe our experiments. The change of specific heat induced by the magnetic field can be understood only in terms of multiband superconductivity.
- Добавил в систему: Васильев Александр Николаевич