Multigap s-wave superconductivity emerging in the 1T′ phase of MoTe2 under hydrostatic pressure

Dongting Zhang; Zhongchen Xu; Tian Le; Chufan Chen; Ge Ye; Fengrui Shi; Shuaishuai Luo; Youguo Shi; Xin Lu

doi:10.1103/PhysRevB.109.144506

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Multigap s-wave superconductivity emerging in the 1T′ phase of MoTe2 under hydrostatic pressure

Dongting Zhang, Zhongchen Xu, Tian Le, Chufan Chen, Ge Ye, Fengrui Shi, Shuaishuai Luo, Youguo Shi, Xin Lu

DOI 10.1103/PhysRevB.109.144506 · Physical Review B

T1

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Abstract

Hydrostatic pressure transforms the superconductor MoTe2 from a type-II Weyl semimetallic Td phase to a topologically trivial 1T′ phase at low temperature, serving as an ideal platform to explore the interplay between topology and superconductivity (SC). We report a soft point-contact-spectroscopy (SPCS) study on single-crystalline MoTe2 under hydrostatic pressure up to 2.5 GPa, where the local SC transition temperature Tc of MoTe2 in the contact region shows the same behavior as the reported pressure phase diagram. Excess current extracted from the integrated conductance subtracted by the normal state shows a positive correlation with the 1T′ phase volume fraction as a function of pressure, supporting that the probed SC under pressure is mainly contributed by the 1T′ phase of MoTe2. Our SPCS spectra are better fitted by a two-gap s-wave Blonder-Tinkham-Klapwijk model in the whole pressure range, yielding 2Δ1/kBTc=2.0–2.5 and 2Δ2/kBTc=4.15–5.0, respectively, and suggesting a strong-coupling SC for 1T′−MoTe2.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
MoTe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.1	Pressure unresolved	unknown
MoTe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3.5	1.2 GPa	onset
MoTe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3.5	1.2 GPa	onset
PbTaSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
BiPd Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
WS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
CsV3Sb5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
PdTe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
NbGe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown