Orbital Ordering and Resonant X-ray Scattering in Layered Manganites

Details Orbital Ordering and Resonant X-ray Scattering in Layered Manganites Orbital Ordering and Resonant X-ray Scattering in Layered Manganites

1999-07-19

arxiv.org/abs/cond-mat/9907255v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures

Scientific paper

10.1103/PhysRevB.62.5690

In layered manganites with orbital and charge orderings, the degeneracy of the Mn $4p$ orbitals as well as the $3d$ ones is lifted by the effects of the $4p$ bands and the local Coulomb interactions. We formulate the atomic scattering factor for the resonant x-ray scattering in the memory function method by taking into account these effects on an equal footing. It is shown that the polarization dependences of the scattering intensities at the orbital and charge superlattice reflections observed in LaSr$_{2}$Mn$_2$O$_7$ are caused by the local and itinerant characters of $4p$ electrons, respectively. We examine the type of the orbital ordered state.

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