Metal Insulator Transitions, Strain and Electron-Lattice Coupling in Calcium Ruthenates

ORAL

Abstract

A general Ginzburg-Landau free energy is proposed for the metal-insulator transition (MIT) in correlated oxides, which incorporates magnetism, octahedral distortions, strain as well as the electronic transition. The theory is used to elucidate important experimental features observed across thermal-induced and current induced MIT in 2-1-4 and Ti-doped 3-2-7 calcium ruthenate compounds, including the coexistence of metallic and insulating domains, occurrence, orientation and lengths of stripes at the domain boundaries, as well as the impact of uniaxial and biaxial strain on the transition temperatures and elasto-resistance. Generalzation to MIT in other systems is presented.

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Presenters

  • Qiang Han

    Physics, Columbia University

Authors

  • Qiang Han

    Physics, Columbia University

  • Rafael M Fernandes

    University of Minnesota, School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA., School of Physics and Astronomy, University of Minnesota, Physics, University of Minnesota

  • Andrew Millis

    Center for Computational Quantum Physics, Flatiron Institute, Physics, Columbia University, Columbia University, Department of Physics, Columbia University, Center for Computational Quantum Physics, Flatiron Institute, NY, NY, 10010, National Institute of Materials Science, Center for Computational Quantum Physics, Flatiorn Institute, Physics Department, Columbia University