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As an A-site-vacant perovskite-type oxide, ReO3 undergoes sequentialpressure-driven structural transitions associated with the rotation of ReO6octahedra. The rhombohedral-I phase stable in the pressure range of 12-38 GPais featured by a lattice of nearly close-packed oxygen layers intercalated withRe cations, in reminiscent of the recently discovered superhydridesuperconductors. A combined study of first-principles calculations andtransport measurements under high pressures enabled us to discoversuperconductivity in the rhombohedral-I phase showing a dome-shaped Tc(P) witha maximum Tc of 17 K at about 30 GPa. In addition to the enhanced density ofstates at the Fermi level compared to that of the ambient phase, thelow-frequency vibrations of hexagonal-close-packed oxygen lattice significantlystrengthen the electron-phonon coupling, which is responsible for observedsuperconductivity with a relatively high Tc. The present work thus establishesa rare case among oxide superconductors that the light-element oxygen latticeplays a crucial role in inducing superconductivity.

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