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, and Hidenori Takagi
TL;DR
This study reports the synthesis of a new pyrochlore ruthenium oxide, Hg2Ru2O7, which exhibits a first-order metal-insulator transition at 107 K linked to structural and magnetic changes, highlighting a novel Ru5+ valence state.
Contribution
The paper introduces a new ruthenium oxide with a unique Ru5+ valence state and characterizes its metal-insulator transition and structural properties.
Findings
Exhibits a first-order metal-insulator transition at 107 K
Undergoes a structural transition from cubic to lower symmetry
Magnetic susceptibility suggests possible spin singlet formation
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.
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