Grant-in-Aid for Scientific Research

Physic and Chemistry of Oxygen Holes: Phase Transitions and Dynamics  in High-Valence Transition-Metal Oxides

Period: FY2000-2002

FUJIMORI, Atsushi (University of Tokyo): Photoemission spectroscopy
TAKANO, Mikio (Kyoto University): High pressure synthesis, Thin film synthesis
NASU, Saburo (Osaka University): Moessbauer spectroscopy under high pressure
SETO, Makoto (Kyoto University): Inelastic nucluear resonance x-ray scattering

What are high-valence oxides ? Oxides with Cr4+, Mn4+, Fe4+, Co4+, Ni3+, Cu3+ such as La1-xSrxFeO3, CaFeO3, Ca1-xSrxFeO3, SrFe1-xCoxO3, La1-xSrxCoO3, La1-xSrxMnO3, CrO2, BaNiO3, LaCuO3, RNiO3, LiNiO2, NaNiO2, BaCoO3

charge disproportionation, metal-insulator transition, ferromagnetism, GMR, quantum-spin fluctuation, orbital ordering, orbital fluctuation