Electronic excitations in strongly correlated electron systems studied by resonant inelastic X-ray scattering

Ishii, Kenji

Strongly correlated electron systems are one of the most important issue in modern solid state physics, because they show interesting phenomena such as high- superconductivity and colossal magnetoresistance. Resonant inelastic X-ray scattering (RIXS) technique in the hard X-ray regime has been developed to clarify their electronic structure. Our recent RIXS studies on metallic manganites and cuprates are described. The excitation across the Mott gap is observed even in the metallic phase and the electron correlation effect persists in the carrier-doped Mott insulators. In addition to the Mott gap excitation, the dispersion relation of the intraband excitation in the upper Hubbard band is successfully observed in the electron-doped cuprates.