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arxiv cond-mat/0702411 v1 pith:7WB6CQ6I submitted 2007-02-17 cond-mat.str-el

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 This is my paper
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keywords hg2ru2o7transitionmetal-insulatoroxiderutheniumstateaccompaniedbehavior
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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.

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