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

doi:10.1143/JPSJ.76.063703

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 Institute for Interdisciplinary Science

Research output: Contribution to journal › Article › peer-review

17 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 language	English
Article number	063703
Journal	journal of the physical society of japan
Volume	76
Issue number	6
DOIs	https://doi.org/10.1143/JPSJ.76.063703
Publication status	Published - Jun 2007

Keywords

Frustrated magnetism
Metal-insulator transition
SDW
Strongly correlated electron
μSr

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1143/JPSJ.76.063703

Cite this

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

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.",

keywords = "Frustrated magnetism, Metal-insulator transition, SDW, Strongly correlated electron, μSr",

author = "Akihiro Koda and Ryosuke Kadono and Kazuki Ohishi and Saha, {Shanta R.} and Wataru Higemoto and Shigeki Yonezawa and Yuji Muraoka and Zenji Hiroi",

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T1 - Anomalous magnetic phase in an undistorted pyrochlore oxide Cd 2Os 2O 7 induced by geometrical frustration

AU - Koda, Akihiro

AU - Kadono, Ryosuke

AU - Ohishi, Kazuki

AU - Saha, Shanta R.

AU - Higemoto, Wataru

AU - Yonezawa, Shigeki

AU - Muraoka, Yuji

AU - Hiroi, Zenji

PY - 2007/6

Y1 - 2007/6

N2 - 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.

AB - 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.

KW - Frustrated magnetism

KW - Metal-insulator transition

KW - SDW

KW - Strongly correlated electron

KW - μSr

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