We study the orbital ordering and fluctuation in perovskite titanates where the three t2g orbitals are degenerate at each Ti site. The orbital correlation function is calculated by using the random-phase approximation. It is proposed that the successive phase transition for the orbital ordering occurs. This is caused by the multi-components of the orbital order parameters. The characteristic feature of the momentum dependence of the orbital correlation function near the orbital ordering temperature is expected to be observed by the resonant X-ray scattering.
- Orbital ordering
- Phase transition
- Strongly correlated electrons
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering