High-pressure Raman study on the superconducting pyrochlore oxide Cd2Re2O7

The superconducting pyrochlore oxide Cd2Re2O7 (Tc=1K), which is now considered as a candidate of the spin-orbit-coupled metal, shows an inversion-symmetry-breaking structural transition at Ts1=200K. Ts1 decreases with increasing pressure and disappears at around Pc=4.2GPa, where at least four high-p...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 2018-05, Vol.536, p.600-603
Main Authors: Matsubayashi, Yasuhito, Hasegawa, Takumi, Ogita, Norio, Yamaura, Jun-ichi, Hiroi, Zenji
Format: Article
Language:English
Subjects:
Pyrochlore oxide
Raman scattering
Superconductor
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Summary:The superconducting pyrochlore oxide Cd2Re2O7 (Tc=1K), which is now considered as a candidate of the spin-orbit-coupled metal, shows an inversion-symmetry-breaking structural transition at Ts1=200K. 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 4.8GPa. A structural transition at 1.9–3.0GPa and the recovery of inversion symmetry above Pc are observed at 12K.
ISSN:0921-4526
1873-2135
DOI:10.1016/j.physb.2017.10.030