A novel heavy-fermion state in CaCu3Ru4O12

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

*この研究の対応する著者

    研究成果: Article査読

    98 被引用数 (Scopus)

    抄録

    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.

    本文言語English
    ページ(範囲)2373-2376
    ページ数4
    ジャーナルJournal of the Physical Society of Japan
    73
    9
    DOI
    出版ステータスPublished - 2004 9

    ASJC Scopus subject areas

    • 物理学および天文学(全般)

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