Abstract
Pressure-induced charge density wave (CDW) state can overcome the low-temperature limitation for practical application, thus seeking its traces in experiments is of great importance. Herein, we provide spectroscopic evidence for the emergence of room temperature CDW order in the narrow pressure range of 10–15 GPa in bulk VSe2. Moreover, we discovered an 8-coordination structure of VSe2 with C2/m symmetry in the pressure range of 35–65 GPa by combining the X-ray absorption spectroscopy, X-ray diffraction experiments, and the first-principles calculations. These findings are beneficial for furthering our understanding of the charge modulated structure and its behavior under high pressure.
Highlights
Pressure-induced charge density wave (CDW) state can overcome the low-temperature limitation for practical application, seeking its traces in experiments is of great importance
VSe2 crystallizes in the 1T polytype with a space group of P3m1(CdI2-type structure) at ambient conditions, where the V atoms are covalently bonded with the octahedra of Se atoms to form a Se-V-Se layer and these layers are linked through weak van der Waals forces as shown in Fig. 1a,d. 1T-VSe2 undergoes an incommensurate CDW transition around 110 K and commensurate CDW transition around 80 K19 driven by the conventional
From the above-mentioned aspects, we systematically studied the bulk V Se2 system using highpressure X-ray diffraction (XRD), X-ray absorption fine structure (XAFS) spectroscopy, combining with the firstprinciples calculations
Summary
Pressure-induced charge density wave (CDW) state can overcome the low-temperature limitation for practical application, seeking its traces in experiments is of great importance. We discovered an 8-coordination structure of VSe2 with C2/m symmetry in the pressure range of 35–65 GPa by combining the X-ray absorption spectroscopy, X-ray diffraction experiments, and the first-principles calculations. These findings are beneficial for furthering our understanding of the charge modulated structure and its behavior under high pressure.
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