Plaquette Ordering in SU(4) Antiferromagnets

Abstract

We use fermion mean field theory to study possible plaquette ordering in the antiferromagnetic SU(4) Heisenberg model. We find the ground state for both the square and triangular lattices to be the disconnected plaquette state. Our mean field theory gives a first order transition for plaquette ordering for the triangular lattice. Our results suggest a large number of low lying states.

16 pages, 5 figures

References in corpus (3)

• Orbital frustration at the origin of the magnetic behavior in LiNiO2
• Ordered valence bond states in symmetric two-dimensional spin-orbital systems
• Theory for Phase Transitions in Insulating Vanadium Oxide

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