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Signatures of the topological s+− superconducting order parameter in the type-II Weyl semimetal Td-MoTe2

Published inNature communications, vol. 8, no. 1, 1082
Publication date2017-10-20
First online date2017-10-20
Abstract

In its orthorhombic Td polymorph, MoTe2 is a type-II Weyl semimetal, where the Weyl fermions emerge at the boundary between electron and hole pockets. Non-saturating magnetoresistance and superconductivity were also observed in Td-MoTe2. Understanding the superconductivity in Td-MoTe2, which was proposed to be topologically non-trivial, is of eminent interest. Here, we report high-pressure muon-spin rotation experiments probing the temperature-dependent magnetic penetration depth in Td-MoTe2. A substantial increase of the superfluid density and a linear scaling with the superconducting critical temperature Tc is observed under pressure. Moreover, the superconducting order parameter in Td-MoTe2 is determined to have 2-gap s-wave symmetry. We also exclude time-reversal symmetry breaking in the superconducting state with zero-field μSR experiments. Considering the strong suppression of Tc in MoTe2 by disorder, we suggest that topologically non-trivial s+− state is more likely to be realized in MoTe2 than the topologically trivial s++ state.

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Citation (ISO format)
GUGUCHIA, Z. et al. Signatures of the topological s<sup>+−</sup> superconducting order parameter in the type-II Weyl semimetal T<sub>d</sub>-MoTe<sub>2</sub>. In: Nature communications, 2017, vol. 8, n° 1, p. 1082. doi: 10.1038/s41467-017-01066-6
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ISSN of the journal2041-1723
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