Surface magnons and magnetic structures for the fcc anti-ferromagnetic lattice of the second kind: Application to EuTe |
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| Authors: | D Castiel J Nasser |
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| Institution: | Laboratoire de Physique des Solides, Université de Paris-Sud, Centre d''Orsay, 91405 Orsay, France;Service de Physique du Solide et de Résonnance magnétique, CEN Saclay, BP 2, 91 Gif-sur-Yvette, France |
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| 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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