  We report inelastic neutron scattering experiments on a single crystal of the
intermediate valence compound CePd3. At 300 K the magnetic scattering is
quasielastic, with halfwidth of 23 meV, and is independent of momentum transfer
Q. At low temperature, the Q-averaged magnetic spectrum is inelastic,
exhibiting a broad peak centered near Emax = 55 meV. These results, together
with the temperature dependence of the susceptibility, 4f occupation number,
and specific heat, can be fit by the Kondo/Anderson impurity model. The low
temperature scattering near Emax, however, shows significant variations with Q,
reflecting the coherence of the 4f lattice. The intensity is maximal at (1/2,
1/2,0), intermediate at (1/2,0,0) and (0,0,0), and weak at (1/2,1/2,1/2). We
discuss this Q-dependence in terms of current ideas about coherence in heavy
fermion systems.
