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The 5d-transition metal pyrochlore oxide Cd2Re2O7, which was recentlysuggested to be a prototype of the spin-orbit-coupled metal [Phys. Rev. Lett.115, 026401 (2015)], exhibits an inversion-symmetry breaking (ISB) transitionat 200 K and a subsequent superconductivity below 1 K at ambient pressure. Westudy the crystal structure at high pressures up to 5 GPa by means ofsynchrotron X-ray powder diffraction. A rich structural phase diagram isobtained, which contains at least seven phases and is almost consistent withthe electronic phase diagram determined by previous resistivity measurements.Interestingly, the ISB transition vanishes at ~4 GPa, where the enhancement ofthe upper critical field was observed in resistivity. Moreover, it is shownthat the point groups at 8 K, probably kept in the superconducting phases,sequentially transform into piezoelectric, ferroelectric, and centrosymmetricstructures on the application of pressure.

Successive spatial symmetry breaking under high pressure in the spin-orbit-coupled metal Cd2Re2O7