It is shown that, even near half filling, the elementary excitations of the large-U Hubbard model form wide bands of width ∼t, the intersite hopping integral, and that the slave-boson-based mean-field approximation is qualitatively wrong in the relevant limit. This large-U limit has no Kondo-type divergences.
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S. E. Barnes, Physical Review B, 40, 723-726, 1989. "Copyright © 1989 by the American Physical Society.”
Link to the online abstract: http://link.aps.org/doi/10.1103/PhysRevB.40.723
DOI: 10.1103/PhysRevB.40.723