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New superconductor LixFe1+δSe (x ≤ 0.07, Tc up to 44 K) by an electrochemical routeстатья
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: 17 июня 2016 г.
- Авторы: Alekseeva Anastasia M., Drozhzhin Oleg A., Dosaev Kirill A., Antipov Evgeny V., Zakharov Konstantin V., Volkova Olga S., Chareev Dmitriy A., Vasiliev Alexander N., Koz Cevriye, Schwarz Ulrich
- Журнал: Scientific reports
- Том: 6
- Год издания: 2016
- Издательство: Nature Publishing Group
- Местоположение издательства: United Kingdom
- Первая страница: 25624
- DOI: 10.1038/srep25624
- Аннотация: The superconducting transition temperature (Tc) of tetragonal Fe1+δSe was enhanced from 8.5 K to 44 K by chemical structure modification. While insertion of large alkaline cations like K or solvated lithium and iron cations in the interlayer space, the [Fe2Se2] interlayer separation increases significantly from 5.5 Å in native Fe1+δSe to >7 Å in KxFe1−ySe and to >9 Å in Li1−xFex(OH)Fe1−ySe, we report on an electrochemical route to modify the superconducting properties of Fe1+δSe. In contrast to conventional chemical (solution) techniques, the electrochemical approach allows to insert non-solvated Li+ into the Fe1+δSe structure which preserves the native arrangement of [Fe2Se2] layers and their small separation. The amount of intercalated lithium is extremely small (about 0.07 Li+ per f.u.), however, its incorporation results in the enhancement of Tc up to ∼44 K. The quantum-mechanical calculations show that Li occupies the octahedrally coordinated position, while the [Fe2Se2] layers remain basically unmodified. The obtained enhancement of the electronic density of states at the Fermi level clearly exceeds the effect expected on basis of rigid band behavior.
- Добавил в систему: Дрожжин Олег Андреевич