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

Author

Listed:
  • Z. Guguchia

    (Columbia University)

  • F. Rohr

    (Princeton University)

  • Z. Shermadini

    (Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute)

  • A. T. Lee

    (Columbia University)

  • S. Banerjee

    (Columbia University)

  • A. R. Wieteska

    (Columbia University)

  • C. A. Marianetti

    (Columbia University)

  • B. A. Frandsen

    (University of California)

  • H. Luetkens

    (Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute)

  • Z. Gong

    (Columbia University)

  • S. C. Cheung

    (Columbia University)

  • C. Baines

    (Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute)

  • A. Shengelaya

    (Tbilisi State University
    Andronikashvili Institute of Physics of I. Javakhishvili Tbilisi State University)

  • G. Taniashvili

    (Tbilisi State University)

  • A. N. Pasupathy

    (Columbia University)

  • E. Morenzoni

    (Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute)

  • S. J. L. Billinge

    (Columbia University
    Brookhaven National Laboratory)

  • A. Amato

    (Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute)

  • R. J. Cava

    (Princeton University)

  • R. Khasanov

    (Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute)

  • Y. J. Uemura

    (Columbia University)

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.

Suggested Citation

  • Z. Guguchia & F. Rohr & Z. Shermadini & A. T. Lee & S. Banerjee & A. R. Wieteska & C. A. Marianetti & B. A. Frandsen & H. Luetkens & Z. Gong & S. C. Cheung & C. Baines & A. Shengelaya & G. Taniashvili, 2017. "Signatures of the topological s +− superconducting order parameter in the type-II Weyl semimetal T d-MoTe2," Nature Communications, Nature, vol. 8(1), pages 1-8, December.
  • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_s41467-017-01066-6
    DOI: 10.1038/s41467-017-01066-6
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    Cited by:

    1. Z. Guguchia & C. Mielke & D. Das & R. Gupta & J.-X. Yin & H. Liu & Q. Yin & M. H. Christensen & Z. Tu & C. Gong & N. Shumiya & Md Shafayat Hossain & Ts. Gamsakhurdashvili & M. Elender & Pengcheng Dai , 2023. "Tunable unconventional kagome superconductivity in charge ordered RbV3Sb5 and KV3Sb5," Nature Communications, Nature, vol. 14(1), pages 1-10, December.
    2. Teng Ma & Hao Chen & Kunihiro Yananose & Xin Zhou & Lin Wang & Runlai Li & Ziyu Zhu & Zhenyue Wu & Qing-Hua Xu & Jaejun Yu & Cheng Wei Qiu & Alessandro Stroppa & Kian Ping Loh, 2022. "Growth of bilayer MoTe2 single crystals with strong non-linear Hall effect," Nature Communications, Nature, vol. 13(1), pages 1-10, December.
    3. Rustem Khasanov & Bin-Bin Ruan & Yun-Qing Shi & Gen-Fu Chen & Hubertus Luetkens & Zhi-An Ren & Zurab Guguchia, 2024. "Tuning of the flat band and its impact on superconductivity in Mo5Si3−xPx," Nature Communications, Nature, vol. 15(1), pages 1-6, December.

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