Pressure-induced transition from an antiferromagnetic insulator to a ferromagnetic metal in Ca<sub>2</sub>Ru<sub>1-x</sub>M<sub>x</sub>O<sub>4</sub> (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.

*This work was supported by the National Science Foundation via grant DMR-1712101.

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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