Evolution from Kondo lattice to single-ion Kondo behaviour in Ce _(1-x)La_xCu_4Al Al system

摘要

The magnetic susceptibility χ(T) and electrical resistivity ρ(T) of polycrystalline Ce_(1-x)La_xCu_4Al (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 2.54μBCe that corresponds to a free Ce~(3+) 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 Ce_(1-x)La_xCu_4Al 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.