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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, E-mail: naidyuk@ilt.kharkov.ua2018
AbstractAbstract
[en] 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 Δ. The average gap values are 2Δ = 1.30 ± 0.15 meV with a 2Δ/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. (paper)
Source
Available from http://dx.doi.org/10.1088/2053-1583/aad3e2; Country of input: International Atomic Energy Agency (IAEA)
Record Type
Journal Article
Journal
2D Materials; ISSN 2053-1583;
; v. 5(4); [8 p.]

Country of publication
CHALCOGENIDES, DIMENSIONLESS NUMBERS, ELECTRIC CONDUCTIVITY, ELECTRICAL PROPERTIES, ELEMENTS, MATHEMATICAL MODELS, MOLYBDENUM COMPOUNDS, PARTICLE MODELS, PHYSICAL PROPERTIES, REFRACTORY METAL COMPOUNDS, TELLURIDES, TELLURIUM COMPOUNDS, TEMPERATURE RANGE, THERMODYNAMIC PROPERTIES, TRANSITION ELEMENT COMPOUNDS, TRANSITION TEMPERATURE
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