Spin-State Transition in La1−xPrxCoO3
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概要
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We have investigated the crystalline structure and the magnetic properties of La<SUB>1−<I>x</I></SUB>Pr<I><SUB>x</SUB></I>CoO<SUB>3</SUB> single crystals. The crystalline symmetry is rhombohedral <I>R</I>\\bar3<I>c</I> for 0≤<I>x</I>≤0.3, and orthorhombic <I>P<SUB>nma</SUB></I> for 0.7≤<I>x</I>≤1. The lattice volume decreases monotonically with increasing Pr content due to the smaller ionic radius of Pr<SUP>3+</SUP> than La<SUP>3+</SUP>. The temperature dependence of the magnetic susceptibility [χ(<I>T</I>)] arising from Co<SUP>3+</SUP> ions in La<SUB>1−<I>x</I></SUB>Pr<I><SUB>x</SUB></I>CoO<SUB>3</SUB> was evaluated using La<SUB>1−<I>x</I></SUB>Pr<I><SUB>x</SUB></I>AlO<SUB>3</SUB> 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 (Δ<SUB>1</SUB>) increases with increasing Pr content through the chemical pressure. The chemical pressure dependence of Δ<SUB>1</SUB> 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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