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

Author(s): Guguchia, Z; von Rohr, Fabian; Shermadini, Z; Lee, AT; Banerjee, S; et al

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Abstract: In its orthorhombic T d 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 T d-MoTe2. Understanding the superconductivity in T d-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 T d-MoTe2. A substantial increase of the superfluid density and a linear scaling with the superconducting critical temperature T c is observed under pressure. Moreover, the superconducting order parameter in T d-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 T c 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.
Publication Date: 20-Oct-2017
Citation: Guguchia, Z, von Rohr, F, Shermadini, Z, Lee, AT, Banerjee, S, Wieteska, AR, Marianetti, CA, Frandsen, BA, Luetkens, H, Gong, Z, Cheung, SC, Baines, C, Shengelaya, A, Taniashvili, G, Pasupathy, AN, Morenzoni, E, Billinge, SJL, Amato, A, Cava, RJ, Khasanov, R, Uemura, YJ. (2017).Signatures of the topological s+− superconducting order parameter in the type-II Weyl semimetal Td-MoTe2. Nature communications, 8 (1), 1082 - ?. doi:10.1038/s41467-017-01066-6
DOI: doi:10.1038/s41467-017-01066-6
ISSN: 2041-1723
EISSN: 2041-1723
Pages: 1082 - 1082
Language: eng
Type of Material: Journal Article
Journal/Proceeding Title: Nature Communications
Version: Final published version. This is an open access article.

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