Orbital Ordering and Orbital Fluctuations in Transition Metal Oxides

Details Orbital Ordering and Orbital Fluctuations in Transition Metal Oxides Orbital Ordering and Orbital Fluctuations in Transition Metal Oxides

2003-03-06

arxiv.org/abs/cond-mat/0303113v1

Phys. Stat. Sol. (b) 236, 281 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

9 pages, 5 figures

Scientific paper

We summarize some characteristic features of the frustrated magnetic interactions in spin-orbital models adequate for cubic transition metal oxides with orbital degeneracy. A generic tendency towards dimerization, found already in the degenerate Hubbard model, is confirmed for $t_{2g}$ but not for $e_g$ systems. In the $t_{2g}$ case the quantum orbital fluctuations are more pronounced and contribute to a stronger competition between different magnetic and orbital states. Therefore the orbital liquid states exist in some undoped $t_{2g}$ systems, while in the manganites such states can be triggered only by doping.

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