Pressure-induced transition from an antiferromagnetic insulator to a ferromagnetic metal in Ca2Ru1-xMxO4 (M=Cr, Mn and Fe)

ORAL

Abstract

The comparable magnitudes of the Coulomb interaction and 4d-bandwidth can leave ruthenates precariously balanced on the border between metallic and insulating behavior, and/or on the verge of long-range magnetic order. Ca2RuO4 is an antiferromagnetic (AFM) Mott insulator with Neel temperature at TN = 110 K and a first-order metal-insulator transition at TMI = 357 K. It is recognized that Ca2RuO4 and its derivatives are highly sensitive to the lattice degrees of freedom. Here we report that application of modest pressure (< 2.5 GPa) readily destabilizes the AFM Mott state and precipitates a ferromagnetic metallic state at low temperatures in Ca2Ru1-xMxO4 (M=Cr, Mn and Fe). Transport and magnetic properties including neutron diffraction at pressure will be presented and discussed along with other related systems.

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Presenters

  • Hao Zheng

    Department of Physics, University of Colorado, Boulder CO 80309, Department of Physics, University of Colorado, Boulder, CO 80309, Department of Physics, University of Colorado at Boulder, University of Colorado, Boulder

Authors

  • Hao Zheng

    Department of Physics, University of Colorado, Boulder CO 80309, Department of Physics, University of Colorado, Boulder, CO 80309, Department of Physics, University of Colorado at Boulder, University of Colorado, Boulder

  • Feng Ye

    Quantum Condensed Matter Division, Oak Ridge National Laboratory, Neutron Scattering Division, Oak Ridge National LaboratoryOak Ridge, Tennessee 37381, USA, Quantum Condensed Matter Division, Oak Ridge National Laboratory, TN 37831, Oak Ridge National Laboratory, Neutron Scattering Division, Oak Ridge National Laboratory

  • Songxue Chi

    Oak Ridge National Laboratory, Quantum Condensed Matter Division, Oak Ridge National Laboratory, TN 37831, Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge National Lab

  • Hengdi Zhao

    Department of Physics, University of Colorado, Boulder CO 80309, Department of Physics, University of Colorado, Boulder, CO 80309, Department of Physics, University of Colorado at Boulder, University of Colorado, Boulder

  • Yifei Ni

    Department of Physics, University of Colorado, Boulder CO 80309, Department of Physics, University of Colorado, Boulder, CO 80309

  • Yu Zhang

    Department of Physics, University of Colorado, Boulder CO 80309, Department of Physics, University of Colorado, Boulder, CO 80309

  • Gang Cao

    Department of Physics, University of Colorado-Boulder, Department of Physics, University of Colorado, Boulder CO 80309, Department of Physics, University of Colorado, Boulder, CO 80309, Department of Physics, University of Colorado at Boulder, Physics and Astronomy, University of Kentucky, University of Colorado, Boulder, University of Colorado Boulder