Superconductivity Observed in Tantalum Polyhydride at High Pressure
/ Authors
X. He 何, C. Zhang 张, Z. Li 李, S. Zhang 张, B. Min 闵, J. Zhang 张, K. Lu 卢, J. Zhao 赵, L. Shi 史, Y. Peng 彭
and 8 more authors
X. Wang 望, S. Feng 冯, J. Song 宋, L. Wang 王, V. Prakapenka, S. Chariton, H. Liu 刘, C. Jin 靳
/ Abstract
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 I4¯3d phase of TaH3. It is, for the first time to our best knowledge, experimental realization of superconducting hydrides for the VB group of transition metals.
Journal: Chinese Physics Letters