Browsing by Author "Roth, H"

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    Momentum dependence of orbital excitations in Mott-insulating titanates
    (American Physical Society, 2009-09-04) Ulrich, C; Ament, LJP; Ghiringhelli, G; Braicovich, L; Moretti Sala, M; Pezzotta, N; Schmitt, T; Khaliullin, G; van den Brink, J; Roth, H; Lorenz, T; Keimer, B
    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.