Momentum dependence of orbital excitations in Mott-insulating titanates

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. 2008, American Physical Society.

Keywords

X-ray lasers, Orbits, Titanates, Titanium oxides, Electrons, Valence

Citation

Ulrich, C., Ament, L. J. P., Ghiringhelli, G., Braicovich, L., Moretti Sala, M., Pezzotta, N., Schmitt, T., Khaliullin, G., van den Brink, J., Roth, H., Lorenz, T., & Keimer, B. (2012). Momentum dependence of orbital excitations in Mott-insulating titanates. Physical Review Letters, 103(10), 107205. doi:10.1103/PhysRevLett.103.107205