Angular dependence of the upper critical field in the high-pressure $1T^{\prime }$ phase of MoTe${}_2$

Abstract

Superconductivity in the type-II Weyl semimetal candidate MoTe${}_2$ has attracted much attention due to the possible realization of topological superconductivity. Under applied pressure, the superconducting transition temperature is significantly enhanced, while the structural transition from the high-temperature 1$T^{\prime }$ phase to the low-temperature $T_d$ phase is suppressed. Hence, applying pressure allows us to investigate the dimensionality of superconductivity in 1$T^{\prime }$-MoTe${}_2$. We have performed a detailed study of the magnetotransport properties and upper critical field $H_{c2}$ of MoTe${}_2$ under pressure. The magnetoresistance (MR) and Hall coefficient of MoTe${}_2$ are found to be decreasing with increasing pressure. In addition, the Kohler's scalings for the MR data above $\sim$11 kbar show a change of exponent whereas the data at lower pressure can be well scaled with a single exponent. These results are suggestive of a Fermi surface reconstruction when the structure changes from the $T_d$ to 1$T^{\prime }$ phase. The $H_{c2}$-temperature phase diagram constructed at 15 kbar, with $H\parallel ab$ and $H\perp ab$, can be satisfactorily described by the Werthamer-Helfand-Hohenberg model with the Maki parameters $\alpha \sim$ 0.77 and 0.45, respectively. The relatively large $\alpha$ may stem from a small Fermi surface and a large effective mass of semimetallic MoTe${}_2$. The angular dependence of $H_{c2}$ at 15 kbar can be well fitted by the Tinkham model, suggesting the two-dimensional nature of superconductivity in the high-pressure 1$T^{\prime }$ phase.

6 pages. Phys. Rev. Mater. (in press)

References in corpus (8)

• Titanic Magnetoresistance in WTe2
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• Anomalous Upper Critical Field in CeCoIn_5/YbCoIn_5 Superlattices with a Rashba-type Heavy Fermion Interface
• Anticorrelation between polar lattice instability and superconductivity in the Weyl semimetal candidate MoTe2
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• Separation of Electron and Hole Dynamics in the Semimetal LaSb
• The origin of the turn-on phenomenon in Td-MoTe2
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• Superconducting pairing symmetry in MoTe${}_2$
• Shubnikov-de Haas oscillations of biaxial-strain-tuned superconductors in pulsed magnetic field up to 60 T
• Suppression of both superconductivity and structural transition in hole-doped MoTe${}_2$ induced by Ta substitution