Anomalous magnetic phase in an undistorted pyrochlore oxide Cd 2Os 2O 7 induced by geometrical frustration

Akihiro Koda, Ryosuke Kadono, Kazuki Ohishi, Shanta R. Saha, Wataru Higemoto, Shigeki Yonezawa, Yuji Muraoka, Zenji Hiroi

    Research output: Contribution to journalArticlepeer-review

    14 Citations (Scopus)

    Abstract

    We report on the muon spin rotation/relaxation study of a pyrochlore oxide, Cd 2Os 2O 7, which exhibits a metal-insulator (MI) transition at T MI ≃ 225K without structural phase transition. It reveals strong spin fluctuation (≥10 8 s -1) below the MI transition, suggesting a predominant role of geometrical spin frustration amongst Os 5+ ions. Meanwhile, upon further cooling, an incommensurate spin density wave discontinuously develops below T SDW ≃ 150 K. These observations strongly suggest the occurrence of an anomalous magnetic transition and associated change in the local spin dynamics in undistorted pyrochlore antiferromagnet.

    Original languageEnglish
    Article number063703
    Journaljournal of the physical society of japan
    Volume76
    Issue number6
    DOIs
    Publication statusPublished - Jun 2007

    Keywords

    • Frustrated magnetism
    • Metal-insulator transition
    • SDW
    • Strongly correlated electron
    • μSr

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

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