  We have performed an inelastic neutron scattering study of the low energy
spin dynamics of the heavy fermion compound Ce0.8La0.2Al3 as a function of
temperature and external pressure up to 5 kbar. At temperatures below 3 K, the
magnetic response transforms from a quasi-elastic form, common to many heavy
fermion systems, to a single well-defined inelastic peak, which is extremely
sensitive to external pressure. The scaling of the spin dynamics and the
thermodynamic properties are in agreement with the predictions of the
anisotropic Kondo model.
