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We report inelastic neutron scattering experiments on a single crystal of theintermediate valence compound CePd3. At 300 K the magnetic scattering isquasielastic, with halfwidth of 23 meV, and is independent of momentum transferQ. At low temperature, the Q-averaged magnetic spectrum is inelastic,exhibiting a broad peak centered near Emax = 55 meV. These results, togetherwith the temperature dependence of the susceptibility, 4f occupation number,and specific heat, can be fit by the Kondo/Anderson impurity model. The lowtemperature 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). Wediscuss this Q-dependence in terms of current ideas about coherence in heavyfermion systems.

Q-dependence of the spin fluctuations in the intermediate valence compound CePd3