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

Abstract

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

arXiv comment15 pages, 3 figures

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• Variation in Superconducting Symmetry against Pressure on Noncentrosymmetric Superconductor Cd${}_2$Re${}_2$O${}_7$ Revealed by ${}^{185/187}$Re Nuclear Quadrupole Resonance
• Successive phase transitions of the spin-orbit-coupled metal Cd2Re2O7 probed by high-resolution synchrotron x-ray diffraction
• Optical Hall response in spin-orbit coupled metals: Comparative study of magnetic cluster monopole, quadrupole, and toroidal orders
• High-pressure Raman study on the superconducting pyrochlore oxide Cd2Re2O7
• High-pressure control of optical nonlinearity in the polar Weyl semimetal TaAs
• Domain Control by Adjusting Anisotropic Stress in Pyrochlore Oxide Cd2Re2O7
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