Abstract
The magnetic susceptibility and electrical resistivity of Ce impurities in single crystals of Y-Ce alloys were measured at temperatures down to 1.5 K in the directions parallel and perpendicular to thec axis of the crystal. The experimental results were interpreted in terms of the Kondo effect and the crystal-field effect. The data show that the crystal field of Y splits the2 F 5/2 ground state of the Ce 3+ ion into three doublets, the lowest doublet specified byj z =±1/2. The susceptibility, resistivity, and specific heat results at low temperatures show evidence for the existence of a bound state due to the anisotropic Kondo interaction. Analysis of the low-temperature resistivity data yields a Kondo temperature of 40 K, which is independent of the current direction and the Ce concentration. The susceptibility and the resistivity at 0 K are nearly isotropic.
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