Coulomb correlations intertwined with spin and orbital excitations in LaCoO<sub>3</sub>

ORAL

Abstract

We carried out temperature-dependent (20–550 K) measurements of resonant inelastic x-ray scattering on LaCoO3 to investigate the evolution of its electronic structure across the spin-state crossover. In combination with charge-transfer multiplet calculations, we accurately quantified the renormalized crystal-field excitation energies and spin-state populations. We show that the screening of the effective on-site Coulomb interaction of 3d electrons is orbital selective and coupled to the spin-state crossover in LaCoO3. The results establish that the gradual spin-state crossover is associated with a relative change of Coulomb energy versus bandwidth, leading to a Mott-type insulator-to-metal transition.

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Presenters

  • Jun Okamoto

    • Natl Synchrotron Rad Res Ctr
    • National Synchrotron Radiation Research Center

Authors

  • Keisuke Tomiyasu

    • Department of Physics, Tohoku University
    • Departmenet of Physics, Tohoku University

  • Jun Okamoto

    • Natl Synchrotron Rad Res Ctr
    • National Synchrotron Radiation Research Center

  • Hsiao-Yu Huang

    • Natl Synchrotron Rad Res Ctr
    • National Synchrotron Radiation Research Center

  • Zhi-Ying Chen

    • Departmenet of Physics, National Tsing Hua University

  • Evelyn Pratami Sinaga

    • Departmenet of Physics, Tohoku University

  • Wen-Bin Wu

    • Natl Synchrotron Rad Res Ctr

  • Yen-Yi Chu

    • Natl Synchrotron Rad Res Ctr

  • Amol Singh

    • Natl Synchrotron Rad Res Ctr

  • Ru-Pan Wang

    • Inorganic Chemistry and Catalysis, Utrecht University

  • Frank de Groot

    • Inorganic Chemistry and Catalysis, Utrecht University

  • Ashish Chainani

    • Natl Synchrotron Rad Res Ctr
    • National Synchrotron Radiation Research Center

  • Sumio Ishihara

    • Tohoku University
    • Departmenet of Physics, Tohoku University

  • C. Chen

    • Natl Synchrotron Rad Res Ctr
    • National Synchrotron Radiation Research Center

  • Di-Jing Huang

    • Natl Synchrotron Rad Res Ctr
    • National Synchrotron Radiation Research Center