Superconductivity Observed in Tantalum Polyhydride at High Pressure
- Resource Type
- Working Paper
- Authors
- He, X.; Zhang, C. L.; Li, Z. W.; Zhang, S. J.; Min, B. S.; Zhang, J.; Lu, K.; Zhao, J. F.; Shi, L. C.; Peng, Y.; Wang, X. C.; Feng, S. M.; Song, J.; Wang, L. H.; Prakapenka, V. B.; Chariton, S.; Liu, H. Z.; Jin, C. Q.
- Source
- Chinese Physics Letters 40, 057404 (2023) (Express Letter)
- Subject
- Condensed Matter - Superconductivity
Condensed Matter - Materials Science
- Language
We report experimental discovery of tantalum polyhydride superconductor. It was synthesized at 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 Tc 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 supports the superconductivity nature. The upper critical field at zero temperature {\mu}0Hc2(0) of the superconducting phase is estimated to be ~20 T that corresponds to GL coherent length ~40 angstroms. Our results suggest that the superconductivity may arise from I-43d phase of TaH3. It is, for the first time to our best knowledge, experimental realization of superconducting hydrides for the VB group of transitional metals.
Comment: Published by CPL