Guo Zhiying, Hao Xingyu, Dong Juncai, Li Haijing, Liao Jiangwen, Chen Dongliang
Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China.
University of Chinese Academy of Sciences, Beijing, 100042, China.
Sci Rep. 2021 Sep 13;11(1):18157. doi: 10.1038/s41598-021-97630-8.
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 VSe. Moreover, we discovered an 8-coordination structure of VSe 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.
压力诱导电荷密度波（CDW）态能够克服实际应用中的低温限制，因此在实验中寻找其踪迹具有重要意义。在此，我们提供了光谱证据，证明在块状VSe中10 - 15 GPa的狭窄压力范围内出现了室温CDW有序态。此外，通过结合X射线吸收光谱、X射线衍射实验和第一性原理计算，我们发现了在35 - 65 GPa压力范围内具有C2/m对称性的VSe的八配位结构。这些发现有助于进一步加深我们对电荷调制结构及其在高压下行为的理解。
