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

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-insul...

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Bibliographic Details
Published in:arXiv.org 2007-02
Main Authors: Yamamoto, Ayako, Sharma, Peter A, Okamoto, Yoshihiko, Nakao, Aiko, Hiroko Aruga Katori, Niitaka, Seiji, Hashizume, Daisuke, Takagi, Hidenori
Format: Article
Language:English
Subjects:
Insulators
Magnetic permeability
Metal-insulator transition
Ruthenium oxide
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Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.0702411