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Anisotropy in the upper critical field of FeSe and FeSe0.33Te0.67 single crystalsстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 5 мая 2015 г.
- Авторы: Her J.L., Kohama Y., Matsuda Y., Kindo K., Yang W.H., Chareev D., Mitrofanova E.S., Volkova O., Vasiliev A., Lin J.Y.
- Журнал: Superconductor Science and Technology
- Том: 28
- Год издания: 2015
- Издательство: IOP Publishing
- Местоположение издательства: [Bristol, UK], England
- Первая страница: 045013
- DOI: 10.1088/0953-2048/28/4/045013
- Аннотация: The electric resistivity of single crystalline Fe-based superconductors FeSe and FeSe0.33Te0.67 was measured in pulsed magnetic fields up to 55 T. Te-doped iron selenide, FeSe0.33Te0.67, shows rather isotropic behavior in both magnetoresistance (MR) and upper critical fields ( ⊥ Hc2(0)/ ∥ Hc2(0) = 48 T/ 42 T ∼ 1.14), when an external magnetic field is applied parallel and perpendicular to the crystallographic c-axis. These isotropic behaviors are frequently observed in an iron-based superconductor, and the isotropy in Hc2 can likely be described by the Pauli effect. In contrast, our measurements elucidate that the undoped iron selenide, FeSe, exhibits a clear anisotropy in both MR and Hc2 ( ⊥ Hc2(0)/ ∥ Hc2(0) = 27 T/ 15 T ∼ 1.8). This behavior occurs because the clean in-plane conduction (RRR = 35) allows to form a closed electron orbit within the twodimensional Fermi sheets only for the magnetic field parallel to the c-axis, which results in an appearance of an intrinsic (orbital-effect limited) upper critical field for the undoped FeSe. Doping of Te breaks the clean in-plane conduction and leads to a crossover from an orbital limit dominating behavior to a Pauli limit dominating one.
- Добавил в систему: Васильев Александр Николаевич