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Two-dimensional transition metal dichalcogenide 1 T -VSe 2  exhibits a unique three-dimensional charge density wave (CDW) order below ∼110 K at ambient pressure, which shows unusual evolution under pressure. Here we report on the high-pressure structural and transport properties of 1 T -VSe 2  by extending the pressure up to 57.8 GPa, through electrical transport, synchrotron X-ray diffraction (XRD) and Raman scattering measurements, which unravel two critical pressure points. The CDW transition is found to be enhanced under compression at a rate of 16.5 K/GPa up to the first critical pressure  P  C1  ∼ 12 GPa, at which a structural phase transition from hexagonal  P -3 m 1 to monoclinic  C 2/ m  phase takes place. The second critical pressure  P  C2  ∼ 33 GPa corresponds to another structural transition from monoclinic  C 2/ m  to  P 2 1 / m  phase. These findings extend the phase diagram of pressurized 1 T -VSe 2  and may help to understand pressure tuning of structures in transition metal dichalcogenides.

Structural and Transport Properties of 1T-VSe2 Single Crystal Under High Pressures