Metal-insulator transition in a pyrochlore-type ruthenium oxide, Hg 2Ru2O7

Ayako Yamamoto, Peter A. Sharma, Yoshihiko Okamoto, Aiko Nakao, Hiroko Aruga Katori, Seiji Niitaka, Daisuke Hashizume, Hidenori Takagi

Research output: Contribution to journal › Article

32 Citations (Scopus)

Abstract

A new pyrochlore ruthenium oxide, Hg2Ru2O 7, was synthesized under a high pressure of 6 GPa. In contrast to the extensively studied Ru4+ oxides, this compound possesses a novel Ru5+ valence state, corresponding to a half-filled t 2g 3 electron configuration. Hg2Ru 2O7 exhibits a first order metal-insulator transition at 107 K, accompanied by a structural transition from a cubic to lower symmetry. The behavior of the magnetic susceptibility suggests the possible formation of a spin singlet in the insulating low temperature state.

Original languageEnglish
Article number043703
JournalJournal of the Physical Society of Japan
Volume76
Issue number4
DOIs
Publication statusPublished - 2007 Apr
Externally publishedYes

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ruthenium
insulators
oxides
metals
valence
magnetic permeability
symmetry
configurations
electrons

Keywords

  • Geometrical frustration
  • Metal-insulator transition
  • Pyrochlore-type structure
  • Ruthenium oxide

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Yamamoto, A., Sharma, P. A., Okamoto, Y., Nakao, A., Aruga Katori, H., Niitaka, S., ... Takagi, H. (2007). Metal-insulator transition in a pyrochlore-type ruthenium oxide, Hg 2Ru2O7 Journal of the Physical Society of Japan, 76(4), [043703]. https://doi.org/10.1143/JPSJ.76.043703

Metal-insulator transition in a pyrochlore-type ruthenium oxide, Hg 2Ru2O7 . / Yamamoto, Ayako; Sharma, Peter A.; Okamoto, Yoshihiko; Nakao, Aiko; Aruga Katori, Hiroko; Niitaka, Seiji; Hashizume, Daisuke; Takagi, Hidenori.

In: Journal of the Physical Society of Japan, Vol. 76, No. 4, 043703, 04.2007.

Research output: Contribution to journal › Article

Yamamoto, A, Sharma, PA, Okamoto, Y, Nakao, A, Aruga Katori, H, Niitaka, S, Hashizume, D & Takagi, H 2007, 'Metal-insulator transition in a pyrochlore-type ruthenium oxide, Hg 2Ru2O7 ', Journal of the Physical Society of Japan, vol. 76, no. 4, 043703. https://doi.org/10.1143/JPSJ.76.043703
Yamamoto A, Sharma PA, Okamoto Y, Nakao A, Aruga Katori H, Niitaka S et al. Metal-insulator transition in a pyrochlore-type ruthenium oxide, Hg 2Ru2O7 Journal of the Physical Society of Japan. 2007 Apr;76(4). 043703. https://doi.org/10.1143/JPSJ.76.043703
Yamamoto, Ayako ; Sharma, Peter A. ; Okamoto, Yoshihiko ; Nakao, Aiko ; Aruga Katori, Hiroko ; Niitaka, Seiji ; Hashizume, Daisuke ; Takagi, Hidenori. / Metal-insulator transition in a pyrochlore-type ruthenium oxide, Hg 2Ru2O7 In: Journal of the Physical Society of Japan. 2007 ; Vol. 76, No. 4.
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