Pyrochlore Oxide Superconductor Cd2Re2O7 Revisited

Abstract

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 α-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.

15 pages, 11 figures, J. Phys. Soc. Jpn, in press

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• Electric Toroidal Quadrupoles in Spin-Orbit Coupled Metal Cd${}_2$Re${}_2$O${}_7$
• Unified description of electronic orderings and cross correlations by complete multipole representation
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• Anapole superconductivity from $\mathcal{P}\mathcal{T}$-symmetric mixed-parity interband pairing
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• Cluster Toroidal Multipoles Formed by Electric-Quadrupole and Magnetic-Octupole Trimers: A Possible Scenario for Hidden Orders in Ca${}_5$Ir${}_3$O${}_{12}$
• Crystal structure and the magnetic properties of the 5d transition metal oxide AOsO4 (A = K, Rb, Cs)
• Extremely large magnetoresistance in the hourglass Dirac loop chain metal β-ReO${}_2$
• Pressure-induced insulator-metal transition in two-dimensional Mott insulator NiPS3
• Split Fermi Surfaces of the Spin-Orbit-Coupled Metal Cd2Re2O7 Probed by de Haas-van Alphen Effect
• First-principles studies of spin-orbital physics in pyrochlore oxides
• Low-Temperature Phase of the Cd${}_2$Re${}_2$O${}_7$ Superconductor: Ab initio Phonon Calculations and Raman Scattering
• Crystal structure of the inversion-breaking metal Cd2Re2O7
• Formation and Control of Twin Domains in the Pyrochlore Oxide Cd2Re2O7
• 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
• Magnetoelectric Response in Electric Octupole State: Possible Hidden Order in Cuprate Superconductors
• Electrical and Thermal Transport Properties of the beta-Pyrochlore Oxide CsW2O6
• Pyrochlore Oxide Hg2Os2O7 on Verge of Metal-Insulator Boundary
• Optical Hall response in spin-orbit coupled metals: Comparative study of magnetic cluster monopole, quadrupole, and toroidal orders
• Fermi surface and light quasi particles in hourglass nodal chain metal \b{eta}-ReO2
• Domain Control by Adjusting Anisotropic Stress in Pyrochlore Oxide Cd2Re2O7
• Spin-orbit-coupled metal candidate PbRe2O6
• Metal-insulator transitions in pyrochlore oxides
• Chirality/Axiality-Induced Axiality/Chirality via Surface Polarization
• Superconductivity at 12 K in La${}_2$IOs${}_2$: a 5d metal with osmium honeycomb layer
• Odd-parity multipole order in the spin-orbit coupled metallic pyrochlore Pb${}_2$Re${}_2$O${}_{7-\delta }$
• Introduction to High-Temperature Superconductivity for Solid State Chemists
• Nonlinear frequency-asymmetric optical response in chiral systems
• Electronic Self-Organization in the β-Pyrochlore Oxide CsW2O6
• Symmetry Rules on Multipole Interactions under Crystallographic Point Groups and Application to Multiple-$Q$ Multipole States
• Metallic ruthenium ilmenites: first-principles study of MgRuO${}_3$ and CdRuO${}_3$
• Topological Semimetal KAlGe with Novel Electronic Instability