Metal-insulator Transition in a Pyrochlore-type Ruthenium oxide, Hg2Ru2O7

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, Hg2Ru2O7

Strongly Correlated Electrons 2009-11-13 v1

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

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Abstract

A new pyrochlore ruthenium oxide, Hg2Ru2O7 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. Hg2Ru2O7 exhibits a first order metal-insulator transition at 107 K, accompanied by a structural transition from 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

metal-insulator transition phase transitions high-pressure phase transitions

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@article{arxiv.cond-mat/0702411,
  title  = {Metal-insulator Transition in a Pyrochlore-type Ruthenium oxide, Hg2Ru2O7},
  author = {Ayako Yamamoto and Peter A. Sharma and Yoshihiko Okamoto and Aiko Nakao and Hiroko Aruga Katori and Seiji Niitaka and Daisuke Hashizume and Hidenori Takagi},
  journal= {arXiv preprint arXiv:cond-mat/0702411},
  year   = {2009}
}

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8 pages(text), 3 figures, and 1 page (references)

Metal-insulator Transition in a Pyrochlore-type Ruthenium oxide, Hg2Ru2O7

Abstract

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