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

doi:10.1143/JPSJ.76.043703

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

Global course of Engineering and Science

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

34 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 language	English
Article number	043703
Journal	journal of the physical society of japan
Volume	76
Issue number	4
DOIs	https://doi.org/10.1143/JPSJ.76.043703
Publication status	Published - 2007 Apr

Keywords

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

ASJC Scopus subject areas

Physics and Astronomy(all)

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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 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.",

keywords = "Geometrical frustration, Metal-insulator transition, Pyrochlore-type structure, Ruthenium oxide",

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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 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.

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 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.

KW - Geometrical frustration

KW - Metal-insulator transition

KW - Pyrochlore-type structure

KW - Ruthenium oxide

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