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

    Research output: Contribution to journalArticle

    9 Citations (Scopus)

    Abstract

    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+.

    Original languageEnglish
    Article number054430
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume79
    Issue number5
    DOIs
    Publication statusPublished - 2009 Feb 26

    Fingerprint

    Specific heat
    Substitution reactions
    specific heat
    substitutes
    Fermi level
    Magnetic susceptibility
    Ground state
    Dilution
    dilution
    crossovers
    Metals
    insulators
    Ions
    valence
    magnetic permeability
    ground state
    metals
    ions

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Electronic, Optical and Magnetic Materials

    Cite this

    Heat capacity proportional to T2 induced by Ru substitution in CaCu3 (Ti4-x Rux) O12 (x≈0.5). / Tsukada, I.; Kammuri, R.; Kida, T.; Yoshii, S.; Takeuchi, T.; Hagiwara, M.; Iwakawa, M.; Kobayashi, Wataru; Terasaki, I.

    In: Physical Review B - Condensed Matter and Materials Physics, Vol. 79, No. 5, 054430, 26.02.2009.

    Research output: Contribution to journalArticle

    Tsukada, I, Kammuri, R, Kida, T, Yoshii, S, Takeuchi, T, Hagiwara, M, Iwakawa, M, Kobayashi, W & Terasaki, I 2009, 'Heat capacity proportional to T2 induced by Ru substitution in CaCu3 (Ti4-x Rux) O12 (x≈0.5)', Physical Review B - Condensed Matter and Materials Physics, vol. 79, no. 5, 054430. https://doi.org/10.1103/PhysRevB.79.054430
    Tsukada, I. ; Kammuri, R. ; Kida, T. ; Yoshii, S. ; Takeuchi, T. ; Hagiwara, M. ; Iwakawa, M. ; Kobayashi, Wataru ; Terasaki, I. / Heat capacity proportional to T2 induced by Ru substitution in CaCu3 (Ti4-x Rux) O12 (x≈0.5). In: Physical Review B - Condensed Matter and Materials Physics. 2009 ; Vol. 79, No. 5.
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    abstract = "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+.",
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    AU - Tsukada, I.

    AU - Kammuri, R.

    AU - Kida, T.

    AU - Yoshii, S.

    AU - Takeuchi, T.

    AU - Hagiwara, M.

    AU - Iwakawa, M.

    AU - Kobayashi, Wataru

    AU - Terasaki, I.

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    AB - 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+.

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