Signatures of the topological s+− superconducting order parameter in the type-II Weyl semimetal Td-MoTe2
| Autor: | R. J. Cava, Soham Banerjee, Benjamin A. Frandsen, Abhay Pasupathy, Hubertus Luetkens, Alexander Shengelaya, Zizhou Gong, Rustem Khasanov, Simon J. L. Billinge, Zurab Guguchia, Andrew Wieteska, Alex Taekyung Lee, Zurab Shermadini, Yasutomo J. Uemura, C. Baines, Sky C. Cheung, Chris A. Marianetti, Anthony A. Amato, F. von Rohr, Elvezio Morenzoni, Grigol Taniashvili |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Magnetoresistance
Science General Physics and Astronomy Weyl semimetal 02 engineering and technology Electron 01 natural sciences General Biochemistry Genetics and Molecular Biology Article Superfluidity Condensed Matter::Superconductivity 0103 physical sciences Symmetry breaking lcsh:Science Author Correction 010306 general physics Physics Superconductivity Multidisciplinary Condensed matter physics General Chemistry Fermion 021001 nanoscience & nanotechnology Symmetry (physics) lcsh:Q 0210 nano-technology |
| Zdroj: | Nature Communications Nature Communications, Vol 8, Iss 1, Pp 1-8 (2017) |
| ISSN: | 2041-1723 |
| Popis: | 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. Understanding the superconductivity in topological materials is of eminent interest. Here, Guguchia et al. report temperature-dependent magnetic penetration depth in the superconducting state of T d-MoTe2 under pressure, suggesting a topologically nontrivial s +− order parameter. |
| Databáze: | OpenAIRE |
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