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Abstract
The Kondo lattice at half-filling has been analysed with a time-independent perturbation technique from the J → ∞ limit developed by us. We take an unrestricted tigh-binding band term. Hence, we are able to obtain results wich can be applied to different band models. In particular, we give here the ground state energy and the spin gap for the nearest-neighbours hopping band in d-dimensions.
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