Spin state control of the perovskite Rh/Co oxides

Ichiro Terasaki, Soichiro Shibasaki, Shin Yoshida, Wataru Kobayashi

    Research output: Contribution to journalArticle

    17 Citations (Scopus)

    Abstract

    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

    Original languageEnglish
    Pages (from-to)786-799
    Number of pages14
    JournalMaterials
    Volume3
    Issue number2
    DOIs
    Publication statusPublished - 2010

    Keywords

    • Heikes formula
    • Oxide thermoelectrics
    • Spin state
    • Thermopower

    ASJC Scopus subject areas

    • Materials Science(all)

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  • Cite this

    Terasaki, I., Shibasaki, S., Yoshida, S., & Kobayashi, W. (2010). Spin state control of the perovskite Rh/Co oxides. Materials, 3(2), 786-799. https://doi.org/10.3390/ma3020786