High-pressure Raman study on the superconducting pyrochlore oxide Cd2Re2O7

Abstract

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

References in corpus (13)

• Superconductivity at 1 K in Cd2Re2O7
• Parity-breaking phases of spin-orbit-coupled metals with gyrotropic, ferroelectric and multipolar orders
• A parity-breaking electronic nematic phase transition in the spin-orbit coupled metal Cd${}_2$Re${}_2$O${}_7$
• Odd-parity superconductivity in the vicinity of inversion symmetry breaking in spin-orbit-coupled systems
• Superconductivity in the Correlated Pyrochlore Cd_2Re_2O_7
• Low Temperature Symmetry of Pyrochlore Oxide Cd2Re2O7
• Magnetic and superconducting properties of Cd2Re2O7: Cd NMR and Re NQR
• Topological superconducting phases from inversion symmetry breaking order in spin-orbit-coupled systems
• Goldstone-Mode Phonon Dynamics in the Pyrochlore Cd2Re2O7
• Structural Order Parameter in the Pyrochlore Superconductor Cd2Re2O7
• Correlations and Semimetallic Behaviors in Pyrochlore Oxide Cd2Re2O7
• Successive spatial symmetry breaking under high pressure in the spin-orbit-coupled metal Cd2Re2O7
• Superconductivity in a pyrochlore oxide Cd2Re2O7

Cited by in corpus (2)

• Low-Temperature Phase of the Cd${}_2$Re${}_2$O${}_7$ Superconductor: Ab initio Phonon Calculations and Raman Scattering
• Multipolar superconductivity in Luttinger semimetals