Abstract
A two-sublattice model is presented and applied to the fee antiferromagnetic lattice of the second kind. It includes a Heisenberg hamiltonian for exchange interactions between first and second neighbor spins. Surface spin interactions are kept identical to bulk ones. Surface and bulk magnons are obtained and show some cases of instabilities (soft modes) which may account for surface superstructures. The model is applied to the case of EuTe.
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