Abstract
We consider Kondo holes in a Kondo insulator described by the symmetric Anderson lattice within the mean-field approximation in terms of four slave-bosons per site. Each Kondo hole introduces a bound state in the hybridization gap and a finite concentration of Kondo holes gives rise to an impurity band. The impurity band reduces the threshold for the antiferromagnetic instability displaying re-entrance as a function of Kondo hole concentration, but does not substantially affect ferromagnetism.
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