Details

Autor(en) / Beteiligte

• Guguchia, Z.
• von Rohr, F.
• Shermadini, Z.
• Lee, A. T.
• Banerjee, S.
• Wieteska, A. R.
• Marianetti, C. A.
• Frandsen, B. A.
• Luetkens, H.
• Gong, Z.
• Cheung, S. C.
• Baines, C.
• Shengelaya, A.
• Taniashvili, G.
• Pasupathy, A. N.
• Morenzoni, E.
• Billinge, S. J. L.
• Amato, A.
• Cava, R. J.
• Khasanov, R.
• Uemura, Y. J.

Titel

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

Ist Teil von

• Nature communications, 2017-10, Vol.8 (1), p.1-8, Article 1082

Ort / Verlag

London: Nature Publishing Group

Erscheinungsjahr

2017

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Abstract In its orthorhombic T d polymorph, MoTe 2 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 -MoTe 2 . Understanding the superconductivity in T d -MoTe 2 , 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 -MoTe 2 . 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 -MoTe 2 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 MoTe 2 by disorder, we suggest that topologically non-trivial s +− state is more likely to be realized in MoTe 2 than the topologically trivial s ++ state.