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 journalArticle

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 2g3 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 1

Keywords

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

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Fingerprint Dive into the research topics of 'Metal-insulator transition in a pyrochlore-type ruthenium oxide, Hg <sub>2</sub>Ru<sub>2</sub>O<sub>7</sub>'. Together they form a unique fingerprint.

  • Cite this

    Yamamoto, A., Sharma, P. A., 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, 76(4), [043703]. https://doi.org/10.1143/JPSJ.76.043703