Heat capacity proportional to T2 induced by Ru substitution in CaCu3 (Ti4-x Rux) O12 (x≈0.5)

I. Tsukada*, R. Kammuri, T. Kida, S. Yoshii, T. Takeuchi, M. Hagiwara, M. Iwakawa, Wataru Kobayashi, I. Terasaki

*この研究の対応する著者

    研究成果: Article査読

    11 被引用数 (Scopus)

    抄録

    The effect of Ru substitution for Ti on the ground-state properties of three-dimensional antiferromagnet (AF) CaCu3 Ti4 O12 is studied by means of magnetic susceptibility and heat-capacity measurements. A small amount of Ru substituted for Ti suppresses AF long-range order and induces a new intermediate state with T2 -proportional heat capacity, which shows a clear contrast to a simple spin-dilution effect demonstrated by the Zn substitution for Cu. Ru substitution also creates a finite density of state at the Fermi level while keeping nominal valence of Cu ions to be 2+, which is essential to a novel insulator-to-metal crossover driven by an isovalent substitution of Ru4+ for Ti4+.

    本文言語English
    論文番号054430
    ジャーナルPhysical Review B - Condensed Matter and Materials Physics
    79
    5
    DOI
    出版ステータスPublished - 2009 2月 26

    ASJC Scopus subject areas

    • 凝縮系物理学
    • 電子材料、光学材料、および磁性材料

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