Superconductivity above 80 K in polyhydrides of hafnium

作者：Chunhua Zhang, Xin He, Zhenkun Li, S.J. Zhang, Baosen Min, J. Zhang, Ke Lu, Jianfa Zhao, Lamei Shi, Yi Peng, Xiaocong Wang, S. M. Feng, Rong Yu, Luhong Wang, Vitali B. Prakapenka, Stella Chariton, Haozhe Liu, Changqing Jin · 发表于：Materials Today Physics · 年份：2022 · DOI：10.1016/j.mtphys.2022.100826 · 被引用次数：35 · 研究领域：High-pressure geophysics and materials、Physics of Superconductivity and Magnetism、Iron-based superconductors research

Studies on polyhydrides are attracting growing attentions recently due to their potential high temperature superconductivity (SC). We here report the discovery of SC in hafnium polyhydrides at high pressures. The hafnium superhydrides are synthesized at high pressure and high temperature conditions using diamond anvil cell in combination with in-situ high pressure laser heating technique. The SC was investigated by in-situ high pressure resistance measurements in applied magnetic fields. A superconducting transition with onset Tc ∼83 K was observed at 243 GPa. The upper critical field μ0Hc2(0) was estimated to be 24 T by GL theory and the consequent superconducting coherent length ξ to be ∼37 Å. Our results suggest that the superconducting phase is from C2/m-HfH14. This is the first 5d transition metal polyhydride superconductor with Tc above the liquid nitrogen temperature.