Orbital ordering and frustrations

Details Orbital ordering and frustrations Orbital ordering and frustrations

2003-04-03

arxiv.org/abs/cond-mat/0304089v1

Physics

Condensed Matter

Strongly Correlated Electrons

6 figures, accepted for publication in Journal of Physics A: Mathematical and General

Scientific paper

10.1088/0305-4470/36/35/307

An orbital ordering occurs in many transition metal compounds with Jahn-Teller ions and plays an important role in these materials. At the same time, exchange interactions in orbitally degenerate systems are inherently frustrated, even in materials with simple crystal lattices. We discuss the origin of this frustration, considering in detail materials with a cubic and triangular lattice of transition metal ions. We also discuss possible types of ground states of such systems, e.g., disordered orbital liquids and ordering due to the order-from-disorder mechanism.

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