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Onsager reaction-field approach which corrects Weiss mean-field theory has been very successful in localized magnetism. We generalize this approach to the finite-temperature magnetism of the Hubbard model and calculate the N\'eel temperature TN, the magnetic susceptibility, and the spin-spin correlation function. The results compare well with the available quantum Monte Carlo simulations.
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Cyrot et al. (1996) studied this question.
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