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

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.

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

References in corpus (3)

• Local spin resonance and spin-Peierls-like phase transition in a geometrically frustrated antiferromagnet
• A Novel Pyrochlore Ruthenate: Ca2Ru2O7
• Robust paramagnetism in Bi2-xMxRu2O7 (M=Mn,Fe,Co,Ni,Cu) pyrochlore

Cited by in corpus (11)

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• Emergence of magnetic long-range order in frustrated pyrochlore Nd${}_2$Ir${}_2$O${}_7$ with metal-insulator transition
• Tetrahedral Magnetic Order and the Metal-Insulator Transition in the Pyrochlore Lattice of Cd2Os2O7
• Giant Magnetoresistance Effect in the Metal-Insulator Transition of Pyrochlore Oxide Nd2Ir2O7
• Superconducting Transition in the $\beta$-Pyrochlore AOs${}_2$O${}_6$ (A=Cs, Rb, K) under Pressure
• Magnetic ground state of pyrochlore oxides close to metal-insulator boundary probed by muon spin rotation
• Self-Doping Induced Orbital-Selective Mott Transition in Hg2Ru2O7
• Metal-Insulator Transition and Magnetic Order in the Pyrochlore Oxide Hg2Ru2O7
• Magnetic structures and electronic properties of cubic-pyrochlore ruthenates from first principles
• Neutron scattering study of role of partial disorder-type spin fluctuations in conductivity of frustrated conductor Mn${}_3$Pt
• Electronic Self-Organization in the β-Pyrochlore Oxide CsW2O6