Momentum dependence of orbital excitations in Mott-insulating titanates
release_z6bl2bignbavpposbn43kufmxu
by
C. Ulrich,
L. J. P. Ament,
G. Ghiringhelli,
L. Braicovich,
M. Moretti
Sala,
N. Pezzotta,
T. Schmitt,
G. Khaliullin,
J. van den Brink,
H. Roth,
T.
Lorenz,
B. Keimer
2009
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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