High-temperature metallic state of room-temperature ferromagnet Sr 1-xYxCoO3-δ

Wataru Kobayashi, Shin Yoshida, Ichiro Terasaki

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    Abstract

    Resistivity, thermopower, Hall coefficient, and magnetization are measured for a set of polycrystalline samples of the room-temperature ferromagnet Sr 1-xYxCoO3-δ up to 800 K. A peculiar metallic state accompanied by a large effective magnetic moment of 3.40 μB/Co is observed above 600 K, indicating that electrons on the Co3+ ions are magnetic and itinerant. The magnetic Co3+ ions survive at low temperatures, which causes the ferromagnetism below 335 K. We attribute this to the large CoO6 octahedra stabilized in the A-site ordered structure.

    Original languageEnglish
    Article number103702
    JournalJournal of the Physical Society of Japan
    Volume75
    Issue number10
    DOIs
    Publication statusPublished - 2006 Oct

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    Keywords

    • A-site ordered structure
    • Cobalt oxide
    • High-temperature metallic state
    • Room-temperature ferromagnetism

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

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