Theory for Phase Transitions in Insulating Vanadium Oxide

Abstract

We show that the recently proposed S=2 bond model with orbital degrees of freedom for insulating V${}_2$O${}_3$ not only explains the anomalous magnetic ordering, but also other mysteries of the magnetic phase transition. The model contains an additional orbital degree of freedom that exhibits a zero temperature quantum phase transtion in the Ising universality class.

5 pages, 2 figures

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