Novel thermoelectric properties of complex transition-metal oxides

Ichiro Terasaki*, Manabu Iwakawa, Tomohito Nakano, Akira Tsukuda, Wataru Kobayashi

*この研究の対応する著者

    研究成果: Article査読

    45 被引用数 (Scopus)

    抄録

    We report how the thermopower of complex transition-metal oxides is susceptible to small changes in material parameters. In the A-site ordered perovskite oxide R2/3Cu3Ti3.6Ru 0.4O12, the thermopower changes from 15 to -100 μV K-1 at 300 K in going from R = La to Er. We associate this with the hybridization between Cu 3d and Ru 4d electrons, which depends on R. For stronger hybridization, the Cu 3d electrons become more itinerant leading to positive thermopower. In the A-site ordered perovskite cobalt oxide Sr 3YCo4O10.5, the spin state of the Co 3+ ions determines the magnitude of the thermopower, where partial isovalent substitution (Ca for Sr and Rh for Co) enhances the thermopower whilst keeping the resistivity intact. These substitutions stabilize the low spin state of the Co3+ ions, which affects the thermopower through the entropy of the background for the carriers. We propose that the control of the magnetism plays a pivotal role in determining the thermopower in a certain class of complex oxides.

    本文言語English
    ページ(範囲)1005-1011
    ページ数7
    ジャーナルDalton Transactions
    39
    4
    DOI
    出版ステータスPublished - 2010

    ASJC Scopus subject areas

    • 無機化学

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