Dense Kondo Behavior in Ce_xLa_1−xAl₂

Abstract

We have measured the electrical resistivity and the magnetic susceptibility of Ce_xLa_1−xAl₂ (x=0–1) single crystals to study the dense Kondo phenomenon. The magnetic resistivities per molar cerium, which result from the combined effect of the crystalline field and the Kondo scattering, are found to be almost the same at higher temperatures than ca. 50 K. The Curie temperature of ca. 30 K and the effective Bohr magneton of ca. 2.5 μ_B are also independent of the concentration of cerium ion. These data show that the dilute Kondo state is continuously connected to the dense Kondo state as a linear function of cerium concentration in the paramagnetic region.