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 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

Fingerprint

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 journalArticle

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, 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.
@article{cf80842046674715b5fea7789dc7ee96,
title = "Metal-insulator transition in a pyrochlore-type ruthenium oxide, Hg 2Ru2O7",
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.",
keywords = "Geometrical frustration, Metal-insulator transition, Pyrochlore-type structure, Ruthenium oxide",
author = "Ayako Yamamoto and Sharma, {Peter A.} and Yoshihiko Okamoto and Aiko Nakao and {Aruga Katori}, Hiroko and Seiji Niitaka and Daisuke Hashizume and Hidenori Takagi",
year = "2007",
month = "4",
doi = "10.1143/JPSJ.76.043703",
language = "English",
volume = "76",
journal = "Journal of the Physical Society of Japan",
issn = "0031-9015",
publisher = "Physical Society of Japan",
number = "4",

}

TY - JOUR

T1 - Metal-insulator transition in a pyrochlore-type ruthenium oxide, Hg 2Ru2O7

AU - Yamamoto, Ayako

AU - Sharma, Peter A.

AU - Okamoto, Yoshihiko

AU - Nakao, Aiko

AU - Aruga Katori, Hiroko

AU - Niitaka, Seiji

AU - Hashizume, Daisuke

AU - Takagi, Hidenori

PY - 2007/4

Y1 - 2007/4

N2 - 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.

AB - 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.

KW - Geometrical frustration

KW - Metal-insulator transition

KW - Pyrochlore-type structure

KW - Ruthenium oxide

UR - http://www.scopus.com/inward/record.url?scp=34247150708&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=34247150708&partnerID=8YFLogxK

U2 - 10.1143/JPSJ.76.043703

DO - 10.1143/JPSJ.76.043703

M3 - Article

VL - 76

JO - Journal of the Physical Society of Japan

JF - Journal of the Physical Society of Japan

SN - 0031-9015

IS - 4

M1 - 043703

ER -