Superconductivity in the Correlated Pyrochlore Cd_2Re_2O_7

Abstract

We report the observation of superconductivity in high-quality Cd${}_2$Re${}_2$O${}_7$ single crystals with room-temperature pyrochlore structure. Resistivity and ac susceptibility measurements establish an onset transition temperature T${}_c^{onset}$ = 1.47 K with transition width $\Delta$T${}_c$ = 0.25 K. In applied magnetic field, the resistive transition shows a type-II character, with an approximately linear temperature-dependence of the upper critical field H${}_{c2}$. The bulk nature of the superconductivity is confirmed by the specific heat jump with $\Delta$C = 37.9 mJ/mol-K. Using the $\gamma$ value extracted from normal-state specific heat data, we obtain $\Delta$C/$\gamma$T${}_c$ = 1.29, close to the weak coupling BCS value. In the normal state, a negative Hall coefficient below 100 K suggests electron-like conduction in this material. The resistivity exhibits a quadratic T-dependence between 2 and 60 K, i.e., $\rho ={\rho }_0$+AT${}^2$, indicative of Fermi-liquid behavior. The values of the Kadowaki-Woods ratio A/${\gamma }^2$ and the Wilson ratio are comparable to that for strongly correlated materials.

4 pages, 5 figures

Cited by in corpus (58)

• New Pyrochlore Oxide Superconductor RbOs2O6
• Extremely strong-coupling superconductivity and anomalous lattice properties in the beta-pyrochlore oxide KOs2O6
• A parity-breaking electronic nematic phase transition in the spin-orbit coupled metal Cd${}_2$Re${}_2$O${}_7$
• New beta-Pyrochlore Oxide Superconductor CsOs2O6
• Metallic "Ferroelectricity" in the Pyrochlore Cd2Re2O7
• Correlation Effects and Structural Dynamics in the $\beta$-Pyrochlore Superconductor KOs${}_2$O${}_6$
• Rattling-Induced Superconductiviy in the Beta-Pyrochlore Oxides AOs2O6
• Low Temperature Symmetry of Pyrochlore Oxide Cd2Re2O7
• Electronic structure of the pyrochlore metals Cd2Os2O7 and Cd2Re2O7
• Electric Toroidal Quadrupoles in Spin-Orbit Coupled Metal Cd${}_2$Re${}_2$O${}_7$
• Mass enhancement, correlations, and strong coupling superconductivity in the beta-pyrochlore KOs2O6
• Unified description of electronic orderings and cross correlations by complete multipole representation
• Superconductivity in Geometrically Frustrated Pyrochlore RbOs2O6
• Magnetic and superconducting properties of Cd2Re2O7: Cd NMR and Re NQR
• Crystal growth, structural studies and superconducting properties of beta-pyrochlore KOs2O6
• Pyrochlore Oxide Superconductor Cd2Re2O7 Revisited
• Second Anomaly in the Specific Heat of beta-Pyrochlore Oxide Superconductor KOs2O6
• Superconducting Properties of the Non-Centrosymmetric Superconductor Re6Hf
• Specific Heat of the beta-Pyrochlore Oxide Superconductors CsOs2O6 and RbOs2O6
• Structural Ordering and Symmetry Breaking in Cd_2Re_2O_7
• Goldstone-Mode Phonon Dynamics in the Pyrochlore Cd2Re2O7
• Thermal Conductivity of the Pyrochlore Superconductor KOs2O6: Strong Electron Correlations and Fully Gapped Superconductivity
• Spin-orbit-coupled ferroelectric superconductivity
• Harnessing Interpretable and Unsupervised Machine Learning to Address Big Data from Modern X-ray Diffraction
• Structural Order Parameter in the Pyrochlore Superconductor Cd2Re2O7
• Study of the magnetic penetration depth in RbOs_2O_6
• Superconducting properties of the pyrochlore oxide Cd2Re2O7
• Possible Anisotropic Order Parameter in Pyrochlore Superconductor KOs${}_2$O${}_6$ Probed by Muon Spin Rotation
• Manipulation and braiding of Weyl nodes using symmetry-constrained phase transitions
• The second phase transition in the pyrochlore oxide Cd2Re2O7
• Correlations and Semimetallic Behaviors in Pyrochlore Oxide Cd2Re2O7
• Field-induced quasiparticle excitations in novel type II superconductors
• Fluctuation Effects on the Physical Properties of Cd2Re2O7 Near 200 K
• Synthesis of superconducting pyrochlore RbOs2O6
• Antisymmetric Thermopolarization by Electric Toroidicity
• Evidence for s-wave superconductivity in the new beta-pyrochlore oxide RbOs2O6
• High-pressure study on the superconducting pyrochlore oxide Cd2Re2O7
• Strongly Anisotropic s-Wave Gaps in Exotic Superconductors
• Successive spatial symmetry breaking under high pressure in the spin-orbit-coupled metal Cd2Re2O7
• Temperature Dependence of the Magnetic Penetration Depth in the Vortex State of the Pyrochlore Superconductor, Cd2Re2O7
• Optical evidence for mass enhancement of quasiparticles in pyrochlore Cd${}_2$Re${}_2$O${}_7$
• Quasiparticle Excitation in the Superconducting Pyrochlore Cd2Re2O7 Probed by Muon Spin Rotation
• Anomalous magnetic phase in an undistorted pyrochlore oxide Cd2Os2O7 induced by geometrical frustration
• Unconventional superconducting properties of noncentrosymmetric Re5.5Ta
• The electrical properties of Cd2Re2O7 under pressure
• Extremely large magnetoresistance in the hourglass Dirac loop chain metal β-ReO${}_2$
• Intrinsic thermodynamic properties of the pyrochlore superconductor RbOs2O6 extracted by condensation energy analysis
• Split Fermi Surfaces of the Spin-Orbit-Coupled Metal Cd2Re2O7 Probed by de Haas-van Alphen Effect
• Low-Temperature Phase of the Cd${}_2$Re${}_2$O${}_7$ Superconductor: Ab initio Phonon Calculations and Raman Scattering
• Evidence for charged critical behavior in the pyrochlore superconductor RbOs2O6
• Variation in Superconducting Symmetry against Pressure on Noncentrosymmetric Superconductor Cd${}_2$Re${}_2$O${}_7$ Revealed by ${}^{185/187}$Re Nuclear Quadrupole Resonance
• High-pressure Raman study on the superconducting pyrochlore oxide Cd2Re2O7
• Magnetic field induced 3D to 1D crossover in type II superconductors
• Metal-insulator transitions in pyrochlore oxides
• Domain Control by Adjusting Anisotropic Stress in Pyrochlore Oxide Cd2Re2O7
• Competition between $d$-wave and $d$+$is$-wave superconductivity in the Hubbard model on a checkerboard lattice
• Structural order parameter and itinerant electron magnetism in Cd2Re2O7
• First Observed Metal-like to Insulator Transition in the vacant 3d orbital Quantum Spin Liquid Tb${}_2$Ti${}_2$O${}_7$