56 / 2023-04-11 17:28:03

Superconductivity in van der Waals metal sulfides under high pressure

高压物理与材料科学 > 氢与高能量密度材料-II

MX₂ and MX₃ are two important material families, in which exotic physical properties exist, such as charge density wave, superconductivity and metal-insulator transition. The layered structures determine the sensitive character of these compounds to external pressure environment. The high-pressure studies on such van der Waals materials have shown diverse physical phenomena, and pressure-induced superconductivity is one of them. Here, we are going to show some cases, especially the superconductivity observed in highly insulating compounds, such as SnS₂, HfS₂ and HfS₃ et al. The introduction of extra sulfur atom in MX₂, the system will transfer from typical 2-dimensional structure to quasi-one-dimensional structure, while the superconductivity behavior changes significantly. Our works will inspire the exploration of new superconductors and be of great benefit on the investigation of superconductivity mechanism. 

  

[1] Binbin Yue, Wei Zhong, Xiaohui Yu, Fang Hong; Superconductivity in the van der Waals crystal SnS₂ up to 105 GPa; Phys. Rev. B; 105, 104514 (2022)

[2] Binbin Yue, Wei Zhong, Wen Deng, Ting Wen, Yonggang Wang, Yunyu Yin, Pengfei Shan, Jian-Tao Wang, Xiaohui Yu, Fang Hong; Insulator-to-Superconductor Transition in Quasi-One-Dimensional HfS₃ under Pressure; J. Am. Chem. Soc.; 145, 1301-1309 (2023)