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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 ?SR 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.

SUBMITTER: Guguchia Z 

PROVIDER: S-EPMC5651900 | biostudies-other | 2017 Oct

REPOSITORIES: biostudies-other

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Signatures of the topological s <sup>+-</sup> superconducting order parameter in the type-II Weyl semimetal T <sub>d</sub>-MoTe<sub>2</sub>.

Guguchia Z Z   von Rohr F F   Shermadini Z Z   Lee A T AT   Banerjee S S   Wieteska A R AR   Marianetti C A CA   Frandsen B A BA   Luetkens H H   Gong Z Z   Cheung S C SC   Baines C C   Shengelaya A A   Taniashvili G G   Pasupathy A N AN   Morenzoni E E   Billinge S J L SJL   Amato A A   Cava R J RJ   Khasanov R R   Uemura Y J YJ  

Nature communications 20171020 1

In its orthorhombic T <sub>d</sub> polymorph, MoTe<sub>2</sub> 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 <sub>d</sub>-MoTe<sub>2</sub>. Understanding the superconductivity in T <sub>d</sub>-MoTe<sub>2</sub>, which was proposed to be topologically non-trivial, is of eminent interest. Here, we report high-pressure muon-spin rotation experiments probing  ...[more]