Abstract
In the study of magnetoresistive manganites, it has been recognized that the orbital degree of freedom plays an important role in the electric and magnetic properties together with the spin and charge degrees. We have developed the resonant x-ray scattering (RXS) technique to observe the charge and orbital ordering using synchrotron radiation. Dipole RXS from ordered Mn3d orbitals has been observed near the MnK-absorption edge in single-layered, bi-layered, and three-dimensional perovskite-type manganites. The polarization of the scattered photons is rotated and the azimuthal angle dependence shows a characteristic symmetry. These results are explained based on the microscopic mechanism of RSX. Moreover, the resonant inelastic x-ray scattering (RIXS) to observe orbital excitations is described as well as the recent development of RXS.
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