@article{f0253db906a64873af1a5b97763c06a7,
title = "Signatures of the topological s +- superconducting order parameter in the type-II Weyl semimetal T d-MoTe2 ",
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.",
author = "Z. Guguchia and {Von Rohr}, F. and Z. Shermadini and Lee, {A. T.} and S. Banerjee and Wieteska, {A. R.} and Marianetti, {C. A.} and Frandsen, {B. A.} and H. Luetkens and Z. Gong and Cheung, {S. C.} and C. Baines and A. Shengelaya and G. Taniashvili and Pasupathy, {A. N.} and E. Morenzoni and Billinge, {S. J.L.} and A. Amato and Cava, {R. J.} and R. Khasanov and Uemura, {Y. J.}",
note = "Funding Information: The μSR experiments were carried out at the Swiss Muon Source (SμS) Paul Scherrer Insitute, Villigen, Switzerland. X-ray PDF measurements were conducted on beamline 28-ID-2 of the National Synchrotron Light Source II, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Brookhaven National Laboratory under Contract No. DE-SC0012704. Z.G. gratefully acknowledges the financial support by the Swiss National Science Foundation (Early Postdoc Mobility SNFfellowship P2ZHP2-161980). The material preparation at Princeton was supported by the Gordon and Betty Moore Foundation EPiQS initiative, Grant GBMF-4412. Z.G. and Y.J.U. thank Andrew Millis and Rafael Fernandes for useful discussions. Work at Department of Physics of Columbia University is supported by US NSF DMR-1436095 (DMREF) and NSF DMR-1610633 as well as REIMEI project of Japan Atomic Energy Agency. A.N.P. acknowledges support from the US National Science foundation via grant DMR-1610110. Work in the Billinge group was supported by U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences (DOE-BES) under contract No. DE-SC00112704. S.B. acknowledges support from the National Defense Science and Engineering Graduate Fellowship program. A.S. acknowledges support from the SCOPES Grant No. SCOPES IZ74Z0-160484. B.A.F. achknowledges support from DOE-BES Materials Sciences and Engineering Division under Contract No. DE-AC02-05-CH11231 and Grant No. DE-AC03-76SF008. Publisher Copyright: {\textcopyright} 2017 The Author(s).",
year = "2017",
month = dec,
day = "1",
doi = "10.1038/s41467-017-01066-6",
language = "English (US)",
volume = "8",
journal = "Nature Communications",
issn = "2041-1723",
publisher = "Nature Publishing Group",
number = "1",
}