Tunable structural phase transition and superconductivity in the Weyl semimetal Mo1−xWxTe2
R. Dahal, L. Z. Deng, N. Poudel, M. Gooch, Z. Wu, H. C. Wu, H. D. Yang, C. K. Chang, C. W. Chu
DOI 10.1103/PhysRevB.101.140505 · Physical Review B
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Abstract
The relationship among structural transition, superconductivity, and doping in the Weyl semimetal Mo1−xWxTe2 has been established through a systematic study of the doping and pressure effects. Doping-dependent resistivity measurements at ambient pressure revealed that the structural transition temperature increases linearly with increasing W content in Mo1−xWxTe2. The observed structural transition temperature (Ts) of MoTe2 at ambient pressure is 249 K and that of WTe2 is 613 K. Temperature-dependent synchrotron x-ray diffraction measurements further confirmed the structural transition in WTe2 at ambient pressure. Pressure was found to continuously suppress the Ts in Mo0.90W0.10Te2,Mo0.60W0.40Te2, and Mo0.25W0.75Te2, and superconductivity emerges in Mo0.90W0.10Te2 and Mo0.60W0.40Te2 above 1.25 K when Ts is suppressed to a lower temperature.
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. | 8.2 | 11.7 GPa | unknown |
| WTe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7 | 16.8 GPa | unknown |
| Mo0.90W0.10Te2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.7 | 1.352 GPa | onset |
| Mo0.90W0.10Te2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.6 | 1.771 GPa | onset |
| Mo0.60W0.40Te2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.59 | 0.835 GPa | onset |
| Mo0.60W0.40Te2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.6 | 1.666 GPa | onset |
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