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Current-Controlled Nonequilibrium State via Current-tuned Lattice in Calcium Ruthenate

ORAL

Abstract

Simultaneous control of structural and physical properties via applied electrical current poses a key, new research topic and technological significance. Studying the spin-orbit-coupled antiferromagnet Ca2RuO4, and its derivatives with Mn-, Fe-, Rh- and Ir-doping, we find that a small applied electrical current couples to the lattice by significantly reducing its orthorhombicity and octahedral rotations, which in turn concurrently diminishes the 125 K- antiferromagnetic transition and induces a new, orbital order below 80 K. That the current-dependence of transport and magnetic properties closely tracks that of the lattice indicates that the current-controlled lattice is the driving force of the observed novel phenomena. The coupling between the lattice and nonequilibrium driven current is interpreted in terms of t2g orbital occupancies [1].

[1] Nonequilibrium Orbital Transitions via Applied Electrical Current in Calcium Ruthenates, Hengdi Zhao et al, Phys. Rev. B 100, 241104(R) (2019)

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Presenters

  • Hengdi Zhao

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

Authors

  • Hengdi Zhao

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

  • Bing Hu

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

  • Feng Ye

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

  • Christina Hoffmann

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

  • Itamar Kimchi

    University of Colorado, Boulder, School of Physics, Georgia Institute of Technology

  • Gang Cao

    Physics, University of Colorado Boulder, University of Colorado, Boulder, Department of physics, University of Colorado at Boulder, Department of Physics, University of Colorado at Boulder