1.
Phys Rev Lett
; 103(10): 107205, 2009 Sep 04.
Article
in English
| MEDLINE
| ID: mdl-19792341
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.