Evolution from Kondo lattice to single-ion Kondo behaviour in 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 2.54 μ B / 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 T K and maximum in electrical resistivity T m a x with the decrease in Ce concentration for these compounds.