We investigate the ground-state properties of a t2g-orbital Hubbard model on
a triangular lattice at electron density 5.5 by using numerical techniques.
There appear several types of paramagnetic phases, but we observe in common
that one or two orbitals among three orbitals become relevant due to the effect
of orbital arrangement. It is found that charge stripes stabilized by the
nearest-neighbor Coulomb interaction consist of antiferromagnetic/ferro-orbital
chains for small Hund's coupling, while there occurs stripe charge ordering
with ferromagnetic/antiferro-orbital chains for large Hund's coupling.Comment: 2 pages, 2 figures, Proceedings of LT24 (August 10-17, 2005, Orlando
