Nonlinear thermoelectric properties of layered cobalt oxides

Tomohito Nakano, Wataru Kobayashi, Ryoji Funahashi, Kenji Sugiura, Hiromichi Ohta, Kunihito Koumoto, Ichiro Terasaki

    研究成果: Conference contribution

    抄録

    We synthesized whisker-crystal and thin-film samples of the layered cobalt oxide (Bi2Sr2O4)xCoO2 well known as a candidate of a thermoelectric material, and measured their resistivity, voltage-current characteristics and magnetoresistance with pulsed currents. Resistivity of the whisker sample with a small current density of 2 mA/cm2 increases with decreasing temperature below 100 K, suggesting development of a pseudogap on the density of states. This increase is suppressed by a large current density of 110 A/cm2. The nonlinear voltage-current characteristics are observed both for the whisker and thin-film samples. The negative magnetoresistance of the thin-film sample is suppressed by current density. These suggest that the density of states recovers owing to the suppression of the pseudogap by applying large current density.

    本文言語English
    ホスト出版物のタイトルProceedings ICT'07 - 26th International Conference on Thermoelectrics
    ページ121-123
    ページ数3
    DOI
    出版ステータスPublished - 2007
    イベントICT'07 - 26th International Conference on Thermoelectrics - Jeju, Korea, Republic of
    継続期間: 2007 6 32007 6 7

    Other

    OtherICT'07 - 26th International Conference on Thermoelectrics
    CountryKorea, Republic of
    CityJeju
    Period07/6/307/6/7

    ASJC Scopus subject areas

    • Engineering(all)

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