title: Transition from heavy-fermion to mixed-valence behavior in Ce(1-x)Y(x)Al3: a quantitative comparison with the anderson impurity model.
abstract: We present a neutron scattering investigation of Ce1-xYxAl3 as a function of chemical pressure, which induces a transition from heavy-fermion behavior in CeAl3 (T{K}=5 K) to a mixed-valence state at x=0.5 (T{K}=150 K). The crossover can be modeled accurately on an absolute intensity scale by an increase in the k-f hybridization, V{kf}, within the Anderson impurity model. Surprisingly, the principal effect of the increasing V{kf} is not to broaden the low-energy components of the dynamic magnetic susceptibility but to transfer spectral weight to high energy.
authors.affiliation: Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
authors.forename: E A
authors.initials: EA
authors.lastname: Goremychkin
authors.forename: R
authors.initials: R
authors.lastname: Osborn
authors.forename: I L
authors.initials: IL
authors.lastname: Sashin
authors.forename: P
authors.initials: P
authors.lastname: Riseborough
authors.forename: B D
authors.initials: BD
authors.lastname: Rainford
authors.forename: D T
authors.initials: DT
authors.lastname: Adroja
authors.forename: J M
authors.initials: JM
authors.lastname: Lawrence