Superconductivity up to 17 K in the high-pressure rhombohedral-I phase of ReO3: a potential oxide analogy of hydride superconductors

P. F. Shan; T. L. Lu; Z. Y. Liu; Y. Y. Jiao; P. T. Yang; J. Hou; L. Ma; Y. Uwatoko; X. L. Dong; B. S. Wang; M. Liu; J. P. Sun; J. -G. Cheng

doi:10.1093/nsr/nwag425

arXiv · 2304.09011

Superconductivity up to 17 K in the high-pressure rhombohedral-I phase of ReO3: a potential oxide analogy of hydride superconductors

P. F. Shan·T. L. Lu·Z. Y. Liu·Y. Y. Jiao·P. T. Yang·J. Hou·L. Ma·Y. Uwatoko·X. L. Dong·B. S. Wang·M. Liu·J. P. Sun·J. -G. Cheng

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Abstract

As an A-site-vacant perovskite-type oxide, ReO3 undergoes sequential pressure-driven structural transitions associated with the rotation of ReO6 octahedra. The rhombohedral-I phase in the pressure range of 12-39 GPa is featured by a lattice of nearly close-packed oxygen layers intercalated with Re cations, in reminiscent of the recently discovered superhydride superconductors. A combined study of first-principles calculations and transport measurements under high pressures enabled us to discover superconductivity in the rhombohedral-I phase, and it shows a dome-shaped Tc(P) with a maximum Tc of 17 K at about 30 GPa. In addition to the enhanced density of states at Fermi level compared to that of the ambient phase, the vibrations of hexagonal-close-packed oxygen lattice significantly strengthen the electron-phonon coupling, which is responsible for observed superconductivity with a relatively high Tc. The present work thus establishes a rare case among oxide superconductors that the light-element oxygen lattice plays a crucial role in inducing superconductivity.

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P. F. Shan, T. L. Lu, Z. Y. Liu, Y. Y. Jiao, P. T. Yang, J. Hou, L. Ma, Y. Uwatoko, X. L. Dong, B. S. Wang, M. Liu, J. P. Sun, J. -G. Cheng. 2023-04-18. Superconductivity up to 17 K in the high-pressure rhombohedral-I phase of ReO3: a potential oxide analogy of hydride superconductors. https://doi.org/10.1093/nsr%2Fnwag425

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