APS Logo

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.

–

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