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A lattice generalization of the (b 1u ⊗b 2g )⊗b 3u pseudo-Jahn-Teller model is analyzed within mean-field theory. Ferroelectric or antiferroelectric ground states are found for sufficiently large pseudo-Jahn-Teller coupling.

Ferroelectric Phase Transitions in a Lattice Pseudo-Jahn-Teller Model