Abstract
We apply the slave-fermion representation of strongly correlated electrons to the spin-12 infinite-U Anderson lattice near quarter-filling. At the mean-field level we find that one conduction band hybridizes with the local states while the other remains uncoupled. When the Fermi level lies in the up-spin hybridization gap this phase is a partially saturated ferromagnet. In one and two dimensions we find that the spin-wave constant vanishes beyond a certain critical filling. We investigate the hybridization and f-level dependence of this critical electron count for the full range of valence and compare with numerical studies in one and two dimensions.
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