Abstract
The effect of electron correlations on the antiferromagnetic ground state of the oneband Hubbard model is examined. The ground state is found analytically for a rectangular density of states. The region of ordered states is reduced as compared with the mean-field results due to formation of local moments and suppression of charge fluctuations with increasing Coulomb interaction between electrons. Local moments present in the paramagnetic phase have almost the same values as those existing in the antiferromagnetic one. For a half-filled band antiferromagnetism is not destroyed by correlation effects in the limit of weak interactions.
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