Origin of superconductivity in the Weyl semimetal WTe2 under pressure
Pengchao Lu, Joon-Seok Kim, Jing Yang, Hao Gao, Juefei Wu, Dexi Shao, Bin Li, Dawei Zhou, Jian Sun, Deji Akinwande, Dingyu Xing, Jung-Fu Lin
DOI 10.1103/PhysRevB.94.224512 · Physical Review B
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Abstract
The structure and superconductivity of WTe2 under pressure are investigated using ab initio calculations combined with high-pressure synchrotron x-ray diffraction and Raman spectroscopy. We find that the emergence of superconductivity in WTe2 under pressure can be attributed to the phase transition from ambient Td phase to the monoclinic 1T′ structure phase at around 4–5 GPa, which is associated with a sliding of the WTe2 layers, resulting in a critical point in the changes of Te-Te interlayer distance. This phase transition introduces an inversion center and eliminates the topological Weyl fermions in the Td structure. Electron-phonon coupling calculations predict a similar Tc as the reported value, implying that WTe2 might belong to conventional normal Bardeen-Cooper-Schrieffer superconductors.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| WTe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.5 | 5 GPa | unknown |
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