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Impurity scattering effects on the superconducting properties and the tetragonal-to-orthorhombic phase transition in FeSeстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
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Web of Science
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 19 июля 2016 г.
- Авторы: Abdel-Hafiez M., Pu Y.J., Brisbois J., Peng R., Feng D.L., Chareev D.A., Silhanek A.V., Krellner C., Vasiliev A.N., Xiao-Jia Chen
- Журнал: Physical Review B
- Том: 93
- Год издания: 2016
- Издательство: American Physical Society
- Местоположение издательства: United States
- Первая страница: 224508
- DOI: 10.1103/PhysRevB.93.224508
- Аннотация: A comprehensive study of the doping dependence of the phase diagram of FeSe-based superconductors is still requiredduetothelackofacleanandsystematicmeansofdopingcontrol.Here,wereportonthemagneto-optical imaging, thermodynamic and transport properties, as well as in situ angle-resolved photoemission spectroscopy (ARPES) studies of impurity scattering in stoichiometric FeSe single crystals. Co doping at the Fe site is found to decrease the superconducting transition temperature (Tc). The upper critical field and specific heat all indicate a possible multiband superconductivity with strong coupling in the Co-doped system. A remarkable feature in FeSe is that its temperature dependent resistivity exhibits a wide hump at high temperatures, a signature of a crossover from a semiconductinglike behavior to metallic behavior. A structural tetragonal-to-orthorhombic phase transition (Ts) (a consequence of the electronic nematicity) is suppressed by either physical or chemical pressures.DuetothereconstructionoftheFermisurfaceatTs,specificheatanomaliesatTs presentCp/Ts ≈ γn, being γn the Sommerfield coefficient at low temperature. This reflect an additional electronic instability in the FeSe1−xSx system.ARPESdatabetween180and282Kindicatestheexistenceofachemicalpotentialshiftwith increasing thermal excitations, resulting in a change of the Fermi-surface topology and exhibiting a semimetal behavior. We found that the temperature-induced Lifshitz transition is much higher than the temperature for the nematic order.
- Добавил в систему: Васильев Александр Николаевич