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Surface superconductivity in the Weyl semimetal MoTe2 detected by point contact spectroscopyстатья
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: 10 декабря 2018 г.
- Авторы: Naidyuk Yurii, Kvitnitskaya Oksana, Bashlakov Dmytro, Aswartham Saicharan, Morozov Igor, Chernyavskii Ivan, Fuchs Günter, Drechsler Stefan-Lüdwig, Hühne Ruben, Nielsch Kornelius, Büchner Bernd, Efremov Dmitriy
- Журнал: 2D materials
- Том: 5
- Номер: 4
- Год издания: 2018
- Первая страница: 045014
- DOI: 10.1088/2053-1583/aad3e2
- Аннотация: MoTe2 is a Weyl semimetal, which exhibits unique non-saturating magnetoresistance and strongly reinforced superconductivity under pressure. Here, we demonstrate that a novel mesoscopic superconductivity at ambient pressure arises on the surface of MoTe2 with a critical temperature up to 5 K significantly exceeding the bulk T-c = 0.1 K. We measured the derivatives of I-V curves for hetero-contacts of MoTe2 with Ag or Cu, homo-contacts of MoTe2 as well as 'soft' point contacts (PCs). Large number of these hetero-contacts exhibit a dV/dI dependence, which is characteristic for Andreev reflection. It allows us to determine the superconducting gap Delta. The average gap values are 2 Delta = 1.30 +/- 0.15 meV with a 2 Delta/k(B)T(c) ratio of 3.7 +/- 0.4, which slightly exceeds the standard BCS value of 3.52. Furthermore, the temperature dependence of the gap follows a BCS-like behavior, which points to a nodeless superconducting order parameter with some strong-coupling renormalization. Remarkably, the observation of a 'gapless-like' single minimum in the dV/dI of 'soft' PCs may indicate a topological superconducting state of the MoTe2 surface as these contacts probe mainly the interface and avoid additional pressure effect. Therefore, MoTe2 might be a suitable material to study new forms of topological superconductivity.
- Добавил в систему: Морозов Игорь Викторович