Superconductivity Observed in Tantalum Polyhydride at High Pressure

作者：Xiujie He, C. L. Zhang, Z. W. Li, S. J. Zhang, Baosen Min, J. Zhang, Kun Lu, Jianfu Zhao, Liehang Shi, Yang Peng, X. C. Wang, S. M. Feng, Jing Song, Luhong Wang, Vitali B. Prakapenka, Stella Chariton, Haozhe Liu, C. Jin · 发表于：Chinese Physics Letters · 年份：2023 · DOI：10.1088/0256-307x/40/5/057404 · 被引用次数：22 · 研究领域：High-pressure geophysics and materials、Quantum, superfluid, helium dynamics、Hydrogen Storage and Materials

We report experimental discovery of tantalum polyhydride superconductor. It was synthesized under high-pressure and high-temperature conditions using diamond anvil cell combined with in situ high-pressure laser heating techniques. The superconductivity was investigated via resistance measurements at pressures. The highest superconducting transition temperature T c was found to be ∼ 30 K at 197 GPa in the sample that was synthesized at the same pressure with ∼ 2000 K heating. The transitions are shifted to low temperature upon applying magnetic fields that support the superconductivity nature. The upper critical field at zero temperature μ 0 H c2 (0) of the superconducting phase is estimated to be ∼ 20 T that corresponds to Ginzburg–Landau coherent length ∼ 40 Å. Our results suggest that the superconductivity may arise from I 4 ¯ 3 d phase of TaH 3 . It is, for the first time to our best knowledge, experimental realization of superconducting hydrides for the VB group of transition metals.