Field Induced Spin-State Transition in LaCoO<SUB>3</SUB>

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  • Sato Keisuke
    Institute for Solid State Physics, University of Tokyo
  • Matsuo Akira
    Institute for Solid State Physics, University of Tokyo
  • Kindo Koichi
    Institute for Solid State Physics, University of Tokyo
  • Kobayashi Yoshihiko
    Department of Applied Physics and Chemistry, The University of Electro-Communications
  • Asai Kichizo
    Department of Applied Physics and Chemistry, The University of Electro-Communications

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  • Field induced spin-state transition in LaCoO3

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Abstract

The magnetization of LaCoO3 shows a magnetic transition induced by level crossing at a magnetic field of 60 T below 25 K, which is consistent with the energy diagram determined from electron spin resonance experiments. However, the amount of Co ions with g=3.35 contributing to the magnetic transition is sample-dependent and at most 14% of the total Co ions in LaCoO3. We found that the rest of the Co ions also contribute to the magnetization, which is a maximum at around 100 K. We analyzed the magnetization assuming two kinds of Co species, CoI and CoII, both of which have the nonmagnetic ground state. The energies and the g values of the magnetic excited states are 135 K and 3.35 for CoI, and 250–260 K and 1.9–2.0 for CoII, respectively. CoI ions are suggested to be associated with oxygen vacancies and the surface of LaCoO3.

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