Superconducting pairing symmetry in MoTe${}_2$

Abstract

Topological superconductors have long been sought for their potential use in quantum computing. The type-II Weyl semimetal MoTe${}_2$ is an obvious candidate, exhibiting a superconducting state below 500 mK at ambient pressure, but the question remains whether the pairing is conventional $s^{++}$ or topological $s^{+-}$. The application of external pressure favors the superconducting state in MoTe${}_2$ and suppresses the structural transition from $1T^{\prime }$ to $T_d$. The competition between the two structures leads to a mixed phase that strongly enhances the disorder present in the system, remarkably without affecting the superconducting transition temperature, in contrast to the expectation of $s^{+-}$ pairing superconductivity. Our thorough analysis of the electrical and Hall resistivities as a function of pressure yields the most accurate temperature-pressure phase diagram available to date for MoTe${}_2$ and a detailed view of the relationship between disorder and superconductivity, supporting a conventional $s^{++}$ pairing symmetry.

References in corpus (25)

• Topological insulators and superconductors
• Non-Abelian Anyons and Topological Quantum Computation
• Superconductivity in Weyl Semimetal Candidate MoTe2
• Evidence for two superconducting energy gaps in MgB2 by point-contact spectroscopy
• MoTe2: A Type-II Weyl Topological Metal
• Topological Quantum Computation Based on Chiral Majorana Fermions
• Ironing out the details of unconventional superconductivity
• Non-Abelian Topological Orders and Majorana Fermions in Spin-Singlet Superconductors
• Coupled Ferroelectricity and Superconductivity in Bilayer $T_d$-MoTe${}_2$
• Possible topologically non-trivial superconducting order parameter in type-II Weyl semimetal T_d-MoTe_2
• Time-reversal invariant topological superconductivity in doped Weyl semimetals
• Transport evidence of asymmetric spin-orbit coupling in few$-$layer superconducting 1Td$-$MoTe${}_2$
• Superconductivity enhancement in the S-doped Weyl semimetal candidate MoTe2
• Bulk Fermi-surface of the Weyl type-II semi-metallic candidate MoTe2
• Anticorrelation between polar lattice instability and superconductivity in the Weyl semimetal candidate MoTe2
• A comprehensive review on topological superconducting materials and interfaces
• 1T`-MoTe2 single crystal: a possible topological superconductor
• Dimensionality-driven orthorhombic MoTe2 at room temperature
• Elastic and electronic tuning of magnetoresistance in MoTe${}_2$
• Mechanical control of crystal symmetry and superconductivity in Weyl semimetal MoTe${}_2$
• Detection of hole pockets in the candidate type-II Weyl semimetal MoTe${}_2$ from Shubnikov-de Haas quantum oscillations
• Giant enhancement of cryogenic thermopower by polar structural instability in the pressurized semimetal MoTe2
• Angular dependence of the upper critical field in the high-pressure $1T^{\prime }$ phase of MoTe${}_2$
• Topological phase transition in MoTe${}_2$: A Review
• Pressure induced topological quantum phase transition in Weyl semimetal T_d-MoTe_2

Cited by in corpus (1)

• Systematic study of superconductivity in few-layer $T_d$-MoTe${}_2$