  We studied the effects of hole doping on spin correlations in the periodic
Anderson model, mainly at the full and three-quarters-full lower bands cases.
In the full lower band case, strong anti-ferromagnetic correlations develop
when the on-site repulsive interaction strength $U$ becomes comparable to the
quasi-particle band width. In the three-quarters full case, a novel kind of
spin correlation develops that is consistent with the resonance between a
$(\pi,0)$ and a $(0,\pi)$ spin-density wave. In this state the spins on
different sublattices appear uncorrelated. Hole doping away from the completely
full case rapidly destroys the long-range anti-ferromagnetic correlations, in a
manner reminiscent of the destruction of anti-ferromagnetism in the Hubbard
model. In contrast to the Hubbard model, the doping does not shift the peak in
the magnetic structure factor from the $(\pi,\pi)$ position. At dopings
intermediate to the full and three-quarters full cases, only weak spin
correlations exist.
