Momentum dependence of orbital excitations in Mott-insulating titanates
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American Physical Society
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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.
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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