Abstract
Dipole resonant x-ray scattering from ordered Mn orbitals in has been observed near the Mn -absorption edge. The polarization of the scattered photons is rotated from to and the azimuthal angle dependence shows a characteristic twofold symmetry. A theory for the resonant scattering mechanism has been developed by considering the splitting of the Mn levels due to the Mn orbital ordering. The order parameter of the orbital ordering decreases above the Néel temperature ( ) and disappears at , concomitant with a structural phase transition.
- Received 22 April 1998
DOI:https://doi.org/10.1103/PhysRevLett.81.582
©1998 American Physical Society