03-446 Zohar Nussinov, Marek Biskup, Lincoln Chayes and Jeroen van den Brink

Orbital order in classical models of transition-metal compounds (101K, PDF) Sep 30, 03

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Abstract. We consider the classical 120-degree and related orbital models. These are the classical limits of quantum models which describe the interactions among orbitals of transition-metal compounds both with and without Jahn-Teller effects. We demonstrate that at low temperatures these models exhibit a long-range order which arises via an "order by disorder" mechanism. This strongly indicates that there is orbital ordering in the quantum version of these models, notwithstanding recent results on the absence of spin order in these systems.

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