A dilute limit of CeAl$_3$: Emergence of the single-ion Kondo scaling

alloys have been studied by the low temperature specific heat inorder to elucidate the mechanism that determine their ground state. All alloys with Ce concen-trations of 0.0005 ≤x ≤0.1 show a S = 1/2 Kondo behavior. However, the single-ion scalingis observed only below x = 0.01. The true single-ion Kondo temperature is small, 0.2 K, and isidentical to that for dilute CeAl