Pyrochlore Oxide Hg2Os2O7 on Verge of Metal-Insulator Boundary
arXiv:2112.11558 · doi:10.1088/1361-648X/ac4936
Abstract
Semimetallic osmium pyrochlore oxide Cd2Os2O7 undergoes a magnetic transition to an all-in-all-out (AIAO)-type order at 227 K, followed by a crossover to an AIAO insulator at around 210 K. Here, we studied the isostructural and isoelectronic compound Hg2Os2O7 through thermodynamic measurements, muSR spectroscopy and neutron diffraction experiments. A similar magnetic transition, probably to an AIAO-type order, was observed at 88 K, while the resistivity showed a decrease at the transition and remained metallic down to 2 K. Thus, the ground state of Hg2Os2O7 is most likely an AIAO semimetal, which is analogous to the intermediate-temperature state of Cd2Os2O7. Hg2Os2O7 exists on the verge of the metal-insulator boundary on the metal side and provides an excellent platform for studying the electronic instability of 5d electrons with moderate electron correlations and strong spin-orbit interactions.
References in corpus (21)
- Mott physics and band topology in materials with strong spin-orbit interaction
- Topological and magnetic phases of interacting electrons in the pyrochlore iridates
- Topological insulators and metal-insulator transition in the pyrochlore iridates
- Metal-Nonmetal Changeover in Pyrochlore Iridates
- Emergence of magnetic long-range order in frustrated pyrochlore NdIrO with metal-insulator transition
- Spin-orbit-entangled electronic phases in 4 and 5 transition-metal compounds
- Tetrahedral Magnetic Order and the Metal-Insulator Transition in the Pyrochlore Lattice of Cd2Os2O7
- All-in all-out magnetic order and propagating spin-waves in Sm2Ir2O7
- Electronic structure of the pyrochlore metals Cd2Os2O7 and Cd2Re2O7
- Emergent excitation at the magnetic metal-insulator transition in the pyrochlore osmate Cd2Os2O7
- Noncollinear magnetism and spin-orbit coupling in 5d pyrochlore oxide Cd2Os2O7
- Magnetic state of pyrochlore Cd2Os2O7 emerging from strong competition of ligand distortions and longer-range crystalline anisotropy
- Pyrochlore Oxide Superconductor Cd2Re2O7 Revisited
- Searching for the Slater Transition in the Pyrochlore CdOsO with Infrared Spectroscopy
- All-in/all-out magnetic domains: X-ray diffraction imaging and magnetic field control
- Spin superstructure and noncoplanar ordering in metallic pyrochlore magnets with degenerate orbitals
- Anomalous magnetic phase in an undistorted pyrochlore oxide Cd2Os2O7 induced by geometrical frustration
- Spin-orbit coupling effects on spin-phonon coupling in Cd2Os2O7
- Spin and orbital dynamics through the metal-to-insulator transition in CdOsO probed with high-resolution RIXS
- Ultrafast dynamics in the Lifshitz-type 5 pyrochlore antiferromagnet CdOsO
- Coupled Spin-Charge-Phonon Fluctuation in the All-In/All-Out Antiferromagnet CdOsO