Spin-State Transition in La1−xPrxCoO3

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  • Kobayashi Yoshihiko
    Department of Applied Physics and Chemistry, The University of Electro-Communications
  • Mogi Takaaki
    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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  • Spin-State Transition in La1-xPrxCoO3
  • Spin-State Transition in La<sub>1-<i>x</i></sub>Pr<sub><i>x</i></sub>CoO<sub>3</sub>

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Abstract

We have investigated the crystalline structure and the magnetic properties of La1−xPrxCoO3 single crystals. The crystalline symmetry is rhombohedral R\\bar3c for 0≤x≤0.3, and orthorhombic Pnma for 0.7≤x≤1. The lattice volume decreases monotonically with increasing Pr content due to the smaller ionic radius of Pr3+ than La3+. The temperature dependence of the magnetic susceptibility [χ(T)] arising from Co3+ ions in La1−xPrxCoO3 was evaluated using La1−xPrxAlO3 as a reference. The temperature dependence of the effective magnetic moment arising from Co ions is interpreted by the three spin-states low-spin (LS), intermediate-spin (IS) and high-spin (HS). The energy of the IS-state (Δ1) increases with increasing Pr content through the chemical pressure. The chemical pressure dependence of Δ1 agrees with the hydrostatic pressure dependence. In contrast to the first spin-state transition, the second spin-state transition is almost independent of the Pr content.

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