Spin-glass insulating ground state in Y$_{2}$Os$_{2}$O$_{7}$

ORAL

Abstract

4$d$/5$d$ transition-metal oxides can display many exotic physical properties due to the interplay between spin-orbit coupling (SOC), Coulomb interaction, crystal field effect, Hund's coupling, and lattice distortion. The magnetic ground state of systems with $d^{4}$ electronic configuration is under hot debate since the consensus between experiments and theories has not been achieved. A non-magnetic ground state is expected under the $J_{\mathrm{eff}}$ scenario in the presence of SOC. However, various ground states are observed in some $d^{4}$ systems (such as Ir$^{5+}$, Os$^{4+}$, and Ru$^{4+})$. In this talk, I will present our study on Y$_{2}$Os$_{2}$O$_{7}$ with nonmagnetic Y$^{3+}$ at A site which allows us to study the magnetism of Os$^{4+}$ ($d^{4})$ sublattice. Polycrystalline Y$_{2}$Os$_{2}$O$_{7}$ was synthesized by solid state reaction and was studied by measuring electrical resistivity, magnetic susceptibility, specific heat, and neutron powder diffraction. A spin-glass insulating ground state is observed in contrast to the long-range magnetic ordered state in Y$_{2}$Ru$_{2}$O$_{7}$.

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Authors

  • Zhiying Zhao

    Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA

  • Stuart Calder

    Oak Ridge National Laboratory, Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA

  • Michael A. McGuire

    Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA, Oak Ridge National Laboratory

  • Brian Sales

    Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA, Oak Ridge National Laboratory

  • H.D. Zhou

    Department of Physics and Astronomy, University of Tennessee, University of Tennessee, Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA, Univ of Tennessee - Knoxville, U. of Tennessee, University of Tennessee Knoxville, University of Tennessee, TN, USA

  • Jiaqiang Yan

    Material Sciences Division, ORNL, USA, MSTD, Oak Ridge National Laboratory, Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA