A novel heavy-fermion state in CaCu3Ru4O12

Wataru Kobayashi, Ichiro Terasaki, Jun Ichi Takeya, Ichiro Tsukada, Yoichi Ando

    Research output: Contribution to journalArticle

    89 Citations (Scopus)

    Abstract

    We have measured the susceptibility, specific heat, resistivity, and thermopower of CaCu3Ti4-xRuxO12 and CaCu3-yMnyRu4O12, and have found that CaCu3Ru4O12 can be regarded as a heavy-fermion oxide in d-electron systems. The Kondo temperature is near 200 K, and the susceptibility (1.4 × 10-3 cmu/ Cu mol) and the electron specific heat coefficient [28 mJ/(Cu mol K2)] are moderately enhanced. The resistivity is proportional to T2 at low temperatures, and satisfies the Kadowaki-Woods relation. The heavy-fermion state comes from the interaction between the localized moment of Cu 3d and the conduction electron of Ru 4d. An insulator-metal transition occurs between x = 1.5 and 4 in CaCu3-Ti4-xRuxO12, which can be regarded as a transition from a magnetic insulator to a heavy-fermion metal.

    Original languageEnglish
    Pages (from-to)2373-2376
    Number of pages4
    JournalJournal of the Physical Society of Japan
    Volume73
    Issue number9
    DOIs
    Publication statusPublished - 2004 Sep

    Fingerprint

    fermions
    insulators
    specific heat
    magnetic permeability
    electrical resistivity
    conduction electrons
    electrons
    transition metals
    moments
    oxides
    coefficients
    metals
    interactions
    temperature

    Keywords

    • Heavy fermion
    • Ordered perovskite
    • Transition-metal oxide

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

    Cite this

    Kobayashi, W., Terasaki, I., Takeya, J. I., Tsukada, I., & Ando, Y. (2004). A novel heavy-fermion state in CaCu3Ru4O12. Journal of the Physical Society of Japan, 73(9), 2373-2376. https://doi.org/10.1143/JPSJ.73.2373

    A novel heavy-fermion state in CaCu3Ru4O12. / Kobayashi, Wataru; Terasaki, Ichiro; Takeya, Jun Ichi; Tsukada, Ichiro; Ando, Yoichi.

    In: Journal of the Physical Society of Japan, Vol. 73, No. 9, 09.2004, p. 2373-2376.

    Research output: Contribution to journalArticle

    Kobayashi, W, Terasaki, I, Takeya, JI, Tsukada, I & Ando, Y 2004, 'A novel heavy-fermion state in CaCu3Ru4O12', Journal of the Physical Society of Japan, vol. 73, no. 9, pp. 2373-2376. https://doi.org/10.1143/JPSJ.73.2373
    Kobayashi W, Terasaki I, Takeya JI, Tsukada I, Ando Y. A novel heavy-fermion state in CaCu3Ru4O12. Journal of the Physical Society of Japan. 2004 Sep;73(9):2373-2376. https://doi.org/10.1143/JPSJ.73.2373
    Kobayashi, Wataru ; Terasaki, Ichiro ; Takeya, Jun Ichi ; Tsukada, Ichiro ; Ando, Yoichi. / A novel heavy-fermion state in CaCu3Ru4O12. In: Journal of the Physical Society of Japan. 2004 ; Vol. 73, No. 9. pp. 2373-2376.
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    AU - Takeya, Jun Ichi

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    AB - We have measured the susceptibility, specific heat, resistivity, and thermopower of CaCu3Ti4-xRuxO12 and CaCu3-yMnyRu4O12, and have found that CaCu3Ru4O12 can be regarded as a heavy-fermion oxide in d-electron systems. The Kondo temperature is near 200 K, and the susceptibility (1.4 × 10-3 cmu/ Cu mol) and the electron specific heat coefficient [28 mJ/(Cu mol K2)] are moderately enhanced. The resistivity is proportional to T2 at low temperatures, and satisfies the Kadowaki-Woods relation. The heavy-fermion state comes from the interaction between the localized moment of Cu 3d and the conduction electron of Ru 4d. An insulator-metal transition occurs between x = 1.5 and 4 in CaCu3-Ti4-xRuxO12, which can be regarded as a transition from a magnetic insulator to a heavy-fermion metal.

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