Spin-State Transition in La_<1-x>Pr_xCoO_3(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

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We have investigated the crystalline structure and the magnetic properties of La_<1-x>Pr_xCoO_3 single crystals. The crystalline symmetry is rhombohedral R3c for 0≤x≤0.3, and orthorhombic P_<nma> for 0.7≤x≤1. The lattice volume decreases monotonically with increasing Pr content due to the smaller ionic radius of Pr^<3+> than La^<3+>. The temperature dependence of the magnetic susceptibility [x(T)] arising from Co^<3+> ions in La_<1-x>Pr_xCoO_3 was evaluated using La_<1-x>Pr_xAlO_3 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 (△_1) increases with increasing Pr content through the chemical pressure. The chemical pressure dependence of △_1 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.
社団法人日本物理学会の論文
2006-10-15