Anomalous Magnetic Phase in an Undistorted Pyrochlore Oxide Cd<SUB>2</SUB>Os<SUB>2</SUB>O<SUB>7</SUB> Induced by Geometrical Frustration

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  • Koda Akihiro
    Muon Science Laboratory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK) Department of Materials Structure Science, The Graduate University for Advanced Studies (SOKENDAI)
  • Kadono Ryosuke
    Muon Science Laboratory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK) Department of Materials Structure Science, The Graduate University for Advanced Studies (SOKENDAI)
  • Ohishi Kazuki
    Muon Science Laboratory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK)
  • Saha Shanta R.
    Muon Science Laboratory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK)
  • Higemoto Wataru
    Advanced Science Research Center, Japan Atomic Energy Agency
  • Yonezawa Shigeki
    Institute for Solid State Physics, University of Tokyo
  • Muraoka Yuji
    Institute for Solid State Physics, University of Tokyo
  • Hiroi Zenji
    Institute for Solid State Physics, University of Tokyo

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  • Anomalous magnetic phase in an undistorted pyrochlore oxide Cd2Os2O7 induced by geometrical frustration

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Abstract

We report on the muon spin rotation/relaxation study of a pyrochlore oxide, Cd2Os2O7, which exhibits a metal–insulator (MI) transition at TMI\\simeq225 K without structural phase transition. It reveals strong spin fluctuation (≥108 s−1) below the MI transition, suggesting a predominant role of geometrical spin frustration amongst Os5+ ions. Meanwhile, upon further cooling, an incommensurate spin density wave discontinuously develops below TSDW\\simeq150 K. These observations strongly suggest the occurrence of an anomalous magnetic transition and associated change in the local spin dynamics in undistorted pyrochlore antiferromagnet.

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