Suppression of both superconductivity and structural transition in hole-doped MoTe2 induced by Ta substitution
Siu Tung Lam, K. Y. Yip, Swee K. Goh, Kwing To Lai
DOI 10.1103/PhysRevMaterials.7.084802 · Physical Review Materials
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Abstract
Type-II Weyl semimetal MoTe2 exhibits a first-order structural transition at Ts∼250 K and superconducts at Tc∼0.1 K at ambient pressure. Both Ts and Tc can be manipulated by several tuning parameters, such as hydrostatic pressure and chemical substitution. It is often reported that suppressing Ts enhances Tc, but our study shows a different behavior when MoTe2 is hole-doped by Ta. When Ts is suppressed by Ta doping, Tc is also suppressed. Our findings suggest that the suppression of Ts does not necessarily enhance superconductivity in MoTe2. By connecting with the findings of electron-doped MoTe2, we argue that varying electron carrier concentration can effectively tune Tc. In addition, the Hall coefficient is enhanced around the doping region, where Ts is completely suppressed, suggesting that the critical scattering around the structural transition may also play a role in suppressing Tc.
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 | zero_resistance |
| Mo1-xTaxTe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.25 | Pressure unresolved | zero_resistance |
| Mo1-xTaxTe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure unresolved | unknown |
| Mo1-xNbxTe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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