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 journalArticle

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 1 2007

Keywords

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

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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