Electronic and magnetic properties of the cluster magnet Ba<sub>3</sub>LaRu<sub>2</sub>O<sub>9</sub>

ORAL

Abstract

Magnetic materials with electrons delocalized over small molecular clusters, so-called cluster Mott insulators, have recently attracted significant interest in the quest for novel magnetic properties. The extremely short metal-metal distances within the molecular clusters promote significant electron hopping, thus leading to the formation of unusual electronic ground state configurations based on quasi-molecular orbitals. In this talk, we discuss the electronic and magnetic properties of the cluster magnet Ba3LaRu2O9. We present magnetic susceptibility and inelastic neutron scattering data supporting an unusual spin-3/2 per dimer electronic ground state that cannot be understood in a local moment picture. We also present bulk characterization, muon spin relaxation, neutron diffraction, and inelastic neutron scattering data that are indicative of an ordered state arising from a quasi-2D frustrated lattice of Ru dimer building blocks. Finally, we present preliminary results of Raman spectroscopy and neutron diffraction under pressure that reveal a coincident structural/spin state transition at ~1 GPa.

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Presenters

  • Qiang Chen

    • Department of Physics and Astronomy, University of Tennessee, Knoxville

Authors

  • Qiang Chen

    • Department of Physics and Astronomy, University of Tennessee, Knoxville

  • Amanda Clune

    • Department of Chemistry, University of Tennessee, Knoxville
    • Chemistry, University of Tennessee, Knoxville
    • University of Tennessee, Knoxville

  • Jie Ma

    • Department of Physics and Astronomy, Shanghai Jiaotong University
    • Shanghai Jiao Tong University
    • Shanghai Jiao Tong Univ

  • Jinguang Cheng

    • Chinese Academy of Sciences
    • Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences
    • Chinese Academy of Sciences,Institute of Physics
    • Institute of Physics, Chinese Academy of Sciences

  • Keith Taddei

    • Oak Ridge National Laboratory
    • Oak Ridge National Lab
    • Neutron Scattering Division, Oak Ridge National Laboratory
    • HFIR, Oak Ridge National Laboratory

  • Clarina Reloj Dela Cruz

    • Oak Ridge National Laboratory
    • Neutron Scattering Division, Oak Ridge National Laboratory
    • Oak Ridge National Lab
    • SNS, Oak Ridge National Laboratory

  • Matthew Stone

    • Oak Ridge National Lab
    • Neutron Scattering Division, Oak Ridge National Laboratory
    • Quantum Condensed Matter Div, Oak Ridge National Lab
    • Oak Ridge National Laboratory
    • Spallation Neutron Source, Oak Ridge National Laboratory
    • Neutron Scattering Division, Oak Ridge National Lab
    • Neutron Scattering Division, OakRidge National Laboratory

  • Alexander Kolesnikov

    • Oak Ridge National Lab
    • Neutron Scattering Division, Oak Ridge National Laboratory
    • Neutron Scattering Division, Oak Ridge National Lab
    • Oak Ridge National Laboratory

  • Janice Lynn Musfeldt

    • University of Tennessee
    • Department of Chemistry, University of Tennessee, Knoxville
    • Chemistry, University of Tennessee, Knoxville
    • University of Tennessee, Knoxville
    • Chemistry, University of Tennessee, Knoxville, Tennessee, 37996, USA

  • Haidong Zhou

    • University of Tennessee
    • Department of Physics and Astronomy, University of Tennessee, Knoxville
    • University of Knoxville, Tennessee
    • Department of Physics & Astronomy, University of Tennessee
    • University of Tennesse, Knoxville
    • Physics and anstronomy, University of Tennessee
    • Department of Physics, University of Tennessee
    • Physics, University of Tennessee, Knoxville
    • University of Tennessee, Knoxville

  • Adam Aczel

    • Oak Ridge National Laboratory
    • Oak Ridge National Lab
    • Neutron Scattering Division, Oak Ridge National Laboratory
    • Oakridge National Lab