Hirohiko Sato | Chuo University (original) (raw)
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Papers by Hirohiko Sato
Journal of the Physical Society of Japan, 2006
Single crystals of a novel ruthenate, Ca 2 Ru 2 O 7 , were obtained. An X-ray diffraction study o... more Single crystals of a novel ruthenate, Ca 2 Ru 2 O 7 , were obtained. An X-ray diffraction study on a single crystal revealed that this material crystallizes in a pyrochlore structure with a lattice parameter, a = 10.197Å. The magnetic susceptibility above 30 K is the summation of a Curie-Weiss contribution and a constant term independent of temperature. The effective moment per Ru atom is only 0.36 µ B , one order of magnitude smaller than that expected from a localized spin model with S = 3/2 for Ru 5+. Below 23 K, the localized spins freeze in a spin-glass state. The resistivity at room temperature is 2 × 10 −3 Ωcm, comparable to that in metallic, highly correlated oxides.
Journal of the Physical Society of Japan, 2006
Single crystals of a novel ruthenate, Ca 2 Ru 2 O 7 , were obtained. An X-ray diffraction study o... more Single crystals of a novel ruthenate, Ca 2 Ru 2 O 7 , were obtained. An X-ray diffraction study on a single crystal revealed that this material crystallizes in a pyrochlore structure with a lattice parameter, a = 10.197Å. The magnetic susceptibility above 30 K is the summation of a Curie-Weiss contribution and a constant term independent of temperature. The effective moment per Ru atom is only 0.36 µ B , one order of magnitude smaller than that expected from a localized spin model with S = 3/2 for Ru 5+. Below 23 K, the localized spins freeze in a spin-glass state. The resistivity at room temperature is 2 × 10 −3 Ωcm, comparable to that in metallic, highly correlated oxides.