发现镥基富氢高温超导体

（Superconductivity above 70 K observed in lutetium polyhydrides ）

Z. W. Li, X. He, C. L. Zhang, K. Lu, B. S. Min, J. Zhang, S. J. Zhang, J. F. Zhao, L. C. Shi, Y. Peng, S. M. Feng, Z. Deng, J. Song, Q. Q. Liu, X. C. Wang, R. C. Yu, L. H. Wang, Y. Z. Li, J. D. Bass, V. Prakapenka, S. Chariton, H. Z. Liu, and C. Q. Jin

Science China-Physics Mechanics & Astronomy 66, 267411 (2023)

Highlight: 中国科学杂志社(SCPMA)

The binary polyhydrides of heavy rare earth lutetium that shares a similar valence electron configuration to lanthanum have been experimentally discovered to be superconductive. The lutetium polyhydrides were successfully synthesized at high pressure and high temperature conditions using a diamond anvil cell in combinations with the in-situ high pressure laser heating technique. The resistance measurements as a function of temperature were performed at the same pressure of synthesis in order to study the transitions of superconductivity (SC). The superconducting transition with a maximum onset temperature (Tc) 71 K was observed at pressure of 218 GPa in the experiments. The Tc decreased to 65 K when pressure was at 181 GPa. From the evolution of SC at applied magnetic fields, the upper critical field at zero temperature μ0Hc2(0) was obtained to be ~36 T. The in-situ high pressure X-ray diffraction experiments imply that the high Tc SC should arise from the Lu4H23 phase with Pm3n symmetry that forms a new type of hydrogen cage framework different from those reported for previous light rare earth polyhydride superconductors.