Momentum dependence of orbital excitations in Mott-insulating titanates

Autor:	Ulrich, C., Ament, L. J. P., Ghiringhelli, G., Braicovich, L., Sala, M. Moretti, Pezzotta, N., Schmitt, T., Khaliullin, G., Brink, J. van den, Roth, H., Lorenz, T., Keimer, B.
Rok vydání:	2009
Předmět:	Condensed Matter - Strongly Correlated Electrons
Zdroj:	Phys. Rev. Lett. 103, 107205 (2009)
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevLett.103.107205
Popis:	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. Comment: to appear in PRL
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/0908.2497 Zobrazit plný text záznamu View this record from Arxiv