Resonant inelastic X-ray scattering studies of charge excitations

共鳴非弾性X線散乱による電荷励起の研究

石井 賢司

Ishii, Kenji

Resonant inelastic X-ray scattering (RIXS) has developed into a powerful spectroscopy to measure electronic excitations. Especially in the last decade, it has achieved significant progress utilizing brilliant X-rays from third-generation synchrotron radiation facilities. One of the scientific fields studied intensively by RIXS is strongly correlated electron systems. In transition metal oxides, RIXS has been performed mostly at the transition metal K and L-edges. Generally, charge excitations, which occur by the Coulomb interaction with a core hole in the intermediate state, are prominent in the K-edge RIXS spectra. Therefore K-edge RIXS gives us unique capablity to observe momentum-resolved and element-selective charge excitations and I have applied the K-edge RIXS to high-Tc superconducting cuprates. Because electronic orbitals near the Ferm energy is limitted, electronic structure of the cuprates are suitable for studying the electronic correlation in the materials. I will present here two results on the K-edge RIXS of the cuprates.