Evolution from Kondo lattice to single-ion Kondo behaviour in Ce1−xLaxCu4Al system

The magnetic susceptibility χ(T) and electrical resistivity ρ(T) of polycrystalline Ce1−xLaxCu4Al (0.0≤x≤1.0) are presented. Magnetic ordering was not observed down to 2 K. The effective magnetic moment values obtained across the series are in fair agreement with the value 2.54μB/Ce that corresponds to a free Ce3+ ion. Electrical resistivity studies illustrate the evolution from the Kondo lattice model to single-ion Kondo behavior with an increase in La content in the Ce1−xLaxCu4Al alloy series. A compressible Kondo lattice model has been used to describe the decrease in the Kondo temperature TK and maximum in electrical resistivity Tmax with the decrease in Ce concentration for these compounds.