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, W. Kobayashi, I. Terasaki

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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+.

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

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    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, 79(5), [054430]. https://doi.org/10.1103/PhysRevB.79.054430