Searching for the Slater Transition in the Pyrochlore Cd${}_2$Os${}_2$O${}_7$ with Infrared Spectroscopy

Abstract

Infrared reflectance measurements were made on the single crystal pyrochlore Cd${}_2$Os${}_2$O${}_7$ in order to examine the transformations of the electronic structure and crystal lattice across the boundary of the metal insulator transition at $T_{MIT}=226K$. All predicted IR active phonons are observed in the conductivity over all temperatures and the oscillator strength is found to be temperature independent. These results indicate that charge ordering plays only a minor role in the MIT and that the transition is strictly electronic in nature. The conductivity shows the clear opening of a gap with $2\Delta =5.2k_B{T}_{MIT}$. The gap opens continuously, with a temperature dependence similar to that of BCS superconductors, and the gap edge having a distinct $\sigma (\omega )\sim {\omega }^{1/2}$ dependence. All of these observables support the suggestion of a Slater transition in Cd${}_2$Os${}_2$O${}_7$.

4 pages, 4 figures

References in corpus (2)

• Electronic structure of the pyrochlore metals Cd2Os2O7 and Cd2Re2O7
• Sum rules and electrodynamics of high-Tc cuprates in the pseudogap state

Cited by in corpus (26)

• Electrodynamics of Correlated Electron Materials
• Magnetically driven metal-insulator transition in NaOsO3
• Continuous metal-insulator transition of the antiferromagnetic perovskite NaOsO3
• Tetrahedral Magnetic Order and the Metal-Insulator Transition in the Pyrochlore Lattice of Cd2Os2O7
• Emergent excitation at the magnetic metal-insulator transition in the pyrochlore osmate Cd2Os2O7
• Coulomb Correlations in 4d and 5d Oxides from First Principles - or How Spin-Orbit Materials choose their Effective Orbital Degeneracies
• Noncollinear magnetism and spin-orbit coupling in 5d pyrochlore oxide Cd2Os2O7
• Giant spin-phonon-electronic coupling in a 5d oxide
• All-in/all-out magnetic domains: X-ray diffraction imaging and magnetic field control
• Electronic structure and magnetic properties of NaOsO${}_3$
• Infrared evidence of a Slater metal-insulator transition in NaOsO3
• Infrared signatures of hole and spin stripes in La{2-x}Sr{x}CuO{4}
• Selective Interface Control of Order Parameters in Complex Oxides
• Evolution of the magnetic excitations in NaOsO${}_3$ through its metal-insulator transition
• Crossover from itinerant to localized magnetic excitations through the metal-insulator transition in NaOsO${}_{\text{3}}$
• A continuous metal-insulator transition driven by spin correlations
• The electrical properties of Cd2Re2O7 under pressure
• First-principles studies of spin-orbital physics in pyrochlore oxides
• First Principles Study of the Giant Magnetic Anisotropy Energy in Bulk Na4IrO4
• Magnetic-order-driven metal-insulator transitions in the quasi-one-dimensional spin-ladder compounds BaFe${}_2$S${}_3$ and BaFe${}_2$Se${}_3$
• Doping-induced insulator-metal transition in the Lifshitz magnetic insulator NaOsO3
• Continuous magnetic phase transition in half-frustrated Ca2Os2O7
• Spin and orbital dynamics through the metal-to-insulator transition in Cd${}_2$Os${}_2$O${}_7$ probed with high-resolution RIXS
• Pyrochlore Oxide Hg2Os2O7 on Verge of Metal-Insulator Boundary
• Ultrafast dynamics in the Lifshitz-type 5$d$ pyrochlore antiferromagnet Cd${}_2$Os${}_2$O${}_7$
• Metal-insulator transitions in pyrochlore oxides