Diffuse-Neutron-Scattering Measurements of the Fractional Occupancy of the Localized4f1Configuration in Ce-Th and CeAl3

Abstract

Diffuse-neutron-scattering measurements at $2<T<\mathrm{}300\mathrm{}$ K have been employed to determine the fractional occupancy $\eta$ of the localized $4f^1$ configuration. For Ce${\mathrm{Al}}_3$, $\eta =0.9-1.0\mathrm{}$ at 11 K. For ${\mathrm{Ce}}_{0.8}$ ${\mathrm{Th}}_{0.2}$, $\eta =0.4\mathrm{}\pm 0.1$ at 11 K. No evidence of a compensating conduction-electron polatization was observed.