Superconductivity Observed in Tantalum Polyhydride at High Pressure
X. He1,2,3†, C. L. Zhang1,2†, Z. W. Li1,2, S. J. Zhang1, B. S. Min1,2, J. Zhang1,2, K. Lu1,2, J. F. Zhao1,2, L. C. Shi1,2, Y. Peng1,2, X. C. Wang1,2*, S. M. Feng1, J. Song1,2, L. H. Wang4,5*, V. B. Prakapenka6, S. Chariton6, H. Z. Liu7, and C. Q. Jin1,2,3*
1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China 2School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China 3Songshan Lake Materials Laboratory, Dongguan 523808, China 4Shanghai Advanced Research in Physical Sciences, Shanghai 201203, China 5Department of Geology, University of Illinois at Urbana Champaign, Urbana, Illinois 61801, USA 6Center for Advanced Radiations Sources, University of Chicago, Chicago, Illinois 60637, USA 7Center for High Pressure Science & Technology Advanced Research, Beijing 100094, China
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 $T_{\rm c}$ was found to be $\sim$ $30$ K at 197 GPa in the sample that was synthesized at the same pressure with $\sim$ $2000$ 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 $\mu_{0}H_{\rm c2}$(0) of the superconducting phase is estimated to be $\sim$ $20$ T that corresponds to Ginzburg–Landau coherent length $\sim$ $40$ Å. Our results suggest that the superconductivity may arise from $I\bar{4}3d$ 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.
. [J]. 中国物理快报, 2023, 40(5): 57404-057404.
X. He, C. L. Zhang, Z. W. Li, S. J. Zhang, B. S. Min, J. Zhang, K. Lu, J. F. Zhao, L. C. Shi, Y. Peng, X. C. Wang, S. M. Feng, J. Song, L. H. Wang, V. B. Prakapenka, S. Chariton, H. Z. Liu, and C. Q. Jin. Superconductivity Observed in Tantalum Polyhydride at High Pressure. Chin. Phys. Lett., 2023, 40(5): 57404-057404.
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