Spin state control of the perovskite Rh/Co oxides

Ichiro Terasaki*, Soichiro Shibasaki, Shin Yoshida, Wataru Kobayashi

*この研究の対応する著者

    研究成果: Article査読

    21 被引用数 (Scopus)

    抄録

    We show why and how the spin state of transition-metal ions affects the thermoelectric properties of transition-metal oxides by investigating two perovskite-related oxides. In the A-site ordered cobalt oxide Sr3YCo4O10.5, partial substitution of Ca for Sr acts as chemical pressure, which compresses the unit cell volume to drive the spin state crossover, and concomitantly changes the magnetization and thermopower. In the perovskite rhodium oxide LaRhO3, partial substitution of Sr for La acts as hole-doping, and the resistivity and thermopower decrease systematically with the Sr concentration. The thermopower remains large values at high temperatures (>150 μV/K at 800 K), which makes a remarkable contrast to Lax_1SrxCoO3. We associate this with the stability of the low spin state of the Rh3+ ions

    本文言語English
    ページ(範囲)786-799
    ページ数14
    ジャーナルMaterials
    3
    2
    DOI
    出版ステータスPublished - 2010

    ASJC Scopus subject areas

    • 材料科学(全般)

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