High-field magnetization and magnetoresistance of the A-site ordered perovskite oxide CaCu 3Ti 4-xRu xO 12 (0≤x≤4)

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

*この研究の対応する著者

    研究成果: Article査読

    5 被引用数 (Scopus)

    抄録

    We have measured high-field magnetization and magnetoresistance of polycrystalline samples of the A-site ordered perovskite CaCu 3Ti 4-xRu xO 12 (0≤x≤4) utilizing a nondestructive pulsed magnet. We find that the magnetization for x=0.5, 1.0, and 1.5 is nonlinear, and tends to saturate in high fields. This is highly nontrivial because the magnetization for x=0 and 4 is linear in external field up to the highest one. We have analyzed this field dependence based on the thermodynamics of magnetic materials, and propose that the external fields delocalize the holes on the Cu2 + ions in order to maximize the entropy. This scenario is qualitatively consistent with a large magnetoresistance of -70% observed at 4.2 K at 52 T for x=1.5.

    本文言語English
    論文番号195122
    ジャーナルPhysical Review B - Condensed Matter and Materials Physics
    85
    19
    DOI
    出版ステータスPublished - 2012 5月 11

    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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