<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Cd</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Re</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>7</mml:mn></mml:msub></mml:mrow></mml:math>under high pressure: Pyrochlore lattice distortion-driven metal-to-nonmetal transition

Malavi, Pallavi; Karmakar, S.; Sharma, Surinder M.

doi:10.1103/physrevb.93.035139

Cited by 8 publications

(7 citation statements)

References 42 publications

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“…HP measurements by Malavi et al found a transition to the R-3m phase with inversion symmetry above 21 GPa at room temperature, which may be a nonmetallic phase. 96) The occurrence of so many HP phases indicates intimate coupling between the electronic and structural instabilities. It is likely that there are various ways to resolve the Fermi liquid instability of the SOCM in Cd 2 Re 2 O 7 .…”

Section: Multiple Multipolar Phases?mentioning

confidence: 99%

Pyrochlore Oxide Superconductor Cd₂Re₂O₇Revisited

et al. 2018

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The superconducting pyrochlore oxide Cd2Re2O7 is revisited with a particular emphasis on the sample-quality issue. The compound has drawn attention as the only superconductor (Tc = 1.0 K) that has been found in the family of {\alpha}-pyrochlore oxides since its discovery in 2001. Moreover, it exhibits two characteristic structural transitions from the cubic pyrochlore structure, with the inversion symmetry broken at the first one at 200 K. Recently, it has attracted increasing attention as a candidate spin-orbit coupled metal (SOCM), in which specific Fermi liquid instability is expected to lead to an odd-parity order with spontaneous inversion-symmetry breaking [L. Fu, Phys. Rev. Lett. 115, 026401 (2015)] and parity-mixing superconductivity [V. Kozii and L. Fu: Phys. Rev. Lett. 115 (2015) 207002; Y. Wang et al., Phys. Rev. B 93 (2016) 134512]. We review our previous experimental results in comparison with those of other groups in the light of the theoretical prediction of the SOCM, which we consider meaningful and helpful for future progress in understanding this unique compound.Comment: 15 pages, 11 figures, J. Phys. Soc. Jpn, in pres

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Section: Multiple Multipolar Phases?mentioning

confidence: 99%

Pyrochlore Oxide Superconductor Cd₂Re₂O₇Revisited

et al. 2018

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“…Provided that the ISB transition at ambient pressure is caused by the E u soft modes, the two noncentrosymmetric phases of IX (Cm) and IV (Cc) under high pressures may be derived from other odd-parity representations such as A 2u , T 1u and T 2u . Moreover, the high-pressure phases with inversion symmetry, which are phase V (C2/c), phase VIII (C2/m) and the R 3m phase above 21 GPa [19], are possibly induced by electronic instabilities coupled with even-parity phonons towards even-parity multipolar orders. Therefore, very rich physics on the interplay between the electronic instability and crystal structure of the SOCM must be involved in Cd 2 Re 2 O 7 .…”

Section: Raman Shift (Cmmentioning

confidence: 99%

High-pressure Raman study on the superconducting pyrochlore oxide Cd2Re2O7

Matsubayashi

Hasegawa

Ogita

et al. 2018

Physica B: Condensed Matter

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The superconducting pyrochlore oxide Cd 2 Re 2 O 7 (T c = 1 K), which is now considered as a candidate of the spin-orbit-coupled metal, shows an inversionsymmetry-breaking structural transition at T s1 = 200 K. T s1 decreases with increasing pressure and disappears at around P c = 4.2 GPa, 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 P c are observed at 12 K.

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“…Large trigonal distortion has been shown to mix the J eff = 1/2 and J eff = 3/2 states, invalidating the J eff description [53]. The degree of trigonal distortion is generally altered under high pressure, exemplified by the pyrochlore Cd 2 Re 2 O 7 [54] and Eu 2 Sn 2 O 7 [55]. Therefore, if the trigonal distortion is crucial for forming the low-lying bands in Na 2 IrO 3 , the interband transitions are expected to change under pressure.…”

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confidence: 99%

Honeycomb latticeNa2IrO3at high pressures: A robust spin-orbit Mott insulator

et al. 2018

Phys. Rev. B

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The honeycomb iridate Na2IrO3 has received much attention as a candidate to realize a quantum spin liquid state, but the nature of its insulating state remains controversial. We found that the material exhibits structural transitions at 3 and 10 GPa. The former is accompanied by 166-meVsuppression of the activation gap, but the energies for the low-lying interband transitions change by less than 10 meV. This can be reconciled in a picture in which the application of high pressure barely shifts the electronic bands, but rather merely broadens them. First-principles calculations uncover a strong correlation between the band gap and the β angle of the monoclinic structure, indicating non-negligible interlayer coupling. These results offer clear evidence for a spin-orbit Mott insulating state in Na2IrO3 and are inconsistent with the quasimolecular orbital model.

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Cd2Re2O7under high pressure: Pyrochlore lattice distortion-driven metal-to-nonmetal transition

Cited by 8 publications

References 42 publications

Pyrochlore Oxide Superconductor Cd₂Re₂O₇Revisited

Pyrochlore Oxide Superconductor Cd₂Re₂O₇Revisited

High-pressure Raman study on the superconducting pyrochlore oxide Cd2Re2O7

Honeycomb latticeNa2IrO3at high pressures: A robust spin-orbit Mott insulator

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Cd2Re2O7under high pressure: Pyrochlore lattice distortion-driven metal-to-nonmetal transition

Cited by 8 publications

References 42 publications

Pyrochlore Oxide Superconductor Cd2Re2O7Revisited

Pyrochlore Oxide Superconductor Cd2Re2O7Revisited

High-pressure Raman study on the superconducting pyrochlore oxide Cd2Re2O7

Honeycomb latticeNa2IrO3at high pressures: A robust spin-orbit Mott insulator

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Product

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Pyrochlore Oxide Superconductor Cd₂Re₂O₇Revisited

Pyrochlore Oxide Superconductor Cd₂Re₂O₇Revisited