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The superconducting pyrochlore oxide Cd2Re2O7 (Tc = 1 K), which is nowconsidered as a candidate of the spin-orbit-coupled metal, shows aninversion-symmetry-breaking structural transition at Ts1 = 200 K. Ts1 decreaseswith increasing pressure and disappears at around Pc = 4:2GPa, where at leastfour high-pressure phases with tiny structural distortions are suggested bymeans of powder X-ray diffraction [Yamaura PRB 2017]. We have carried out Ramanscattering experiments to investigate changes in the crystal symmetry underhigh pressures up to 4.8 GPa. A structural transition at 1.9-3.0 GPa and therecovery of inversion symmetry above Pc are observed at 12 K.

High-pressure Raman study on the superconducting pyrochlore oxide Cd2Re2O7