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Momentum dependence of orbital excitations in Mott-insulating titanates

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arxiv 0908.2497 v1 pith:UPWXBFC2 submitted 2009-08-18 cond-mat.str-el

C. Ulrich , L. J. P. Ament , G. Ghiringhelli , L. Braicovich , M. Moretti Sala , N. Pezzotta , T. Schmitt , G. Khaliullin
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J. van den Brink H. Roth T. Lorenz B. Keimer
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keywords excitationsorbitaldatadependencemomentummott-insulatingattributedbeen
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abstract

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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