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Intermediate valence compounds containing rare earth or actinide ions arearchetypal systems for the investigation of strong electron correlations. Theireffective electron masses of 10 to 50 times the free electron mass result froma hybridization of the highly localized $f$-electrons with the more itinerant$d$-electrons, which is strong enough that their properties are dominated byon-site electron correlations. To a remarkable degree, this can be modeled bythe Anderson Impurity Model, even though the $f$-electrons are situated on aperiodic lattice. However, in recent years, there has been increasing evidencethat the dynamic magnetic susceptibility of intermediate valence compounds isnot purely local, but shows variations across the Brillouin zone that have beenascribed to $f$-band coherence. So far, this has been based on simplifiedqualitative models. In this article, we present a quantitative comparison ofinelastic neutron scattering from a single crystal of CePd$_3$, measured infour-dimensional (Q,$\omega$)-space, with ab initio calculations, which are inexcellent agreement on an absolute scale. Our results establish that theQ-dependence of the scattering is caused by particle-hole excitations within$f$-$d$ hybridized bands that grow in coherence with decreasing temperature.

Band Excitations in CePd$_3$: A Comparison of Neutron Scattering and ab initio Theory