AUTHOR=Song Dongqi , Zhou Ying , Zhang Min , He Xinyi , Li Xinjian 

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

JOURNAL=Frontiers in Materials

VOLUME=8

YEAR=2021

URL=https://www.frontiersin.org/journals/materials/articles/10.3389/fmats.2021.710849

DOI=10.3389/fmats.2021.710849

ISSN=2296-8016

ABSTRACT=<p>Two-dimensional transition metal dichalcogenide 1<italic>T</italic>-VSe<sub>2</sub> 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<italic>T</italic>-VSe<sub>2</sub> 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 <italic>P</italic><sub>C1</sub> ∼ 12 GPa, at which a structural phase transition from hexagonal <italic>P</italic>-3<italic>m</italic>1 to monoclinic <italic>C</italic>2/<italic>m</italic> phase takes place. The second critical pressure <italic>P</italic><sub>C2</sub> ∼ 33 GPa corresponds to another structural transition from monoclinic <italic>C</italic>2/<italic>m</italic> to <italic>P</italic>2<sub>1</sub>/<italic>m</italic> phase. These findings extend the phase diagram of pressurized 1<italic>T</italic>-VSe<sub>2</sub> and may help to understand pressure tuning of structures in transition metal dichalcogenides.</p>