Momentum dependence of orbital excitations in Mott-insulating titanates

Details Momentum dependence of orbital excitations in Mott-insulating titanates Momentum dependence of orbital excitations in Mott-insulating titanates

2009-08-18

arxiv.org/abs/0908.2497v1

Phys. Rev. Lett. 103, 107205 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

to appear in PRL

Scientific paper

High-resolution resonant inelastic x-ray scattering has been used to determine the momentum dependence of orbital excitations in Mott-insulating LaTiO$_3$ and YTiO$_3$ over a wide range of the Brillouin zone. The data are compared to calculations in the framework of lattice-driven and superexchange-driven orbital ordering models. A superexchange model in which the experimentally observed modes are attributed to two-orbiton excitations yields the best description of the data.

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