Kondo behaviour of the solid solution (Ce1−xLax)PtGa Original Research Article

The solid solution (Ce1−xLax)PtGa has been studied through X-ray diffraction, magnetization (σ (B )), magnetic susceptibility (χ (T )), electrical resistivity (ρ (T )), magnetoresistivity (MR) and heat capacity (C P(T )) measurements. The Néel temperature (T N=3.3 K) for CePtGa is lowered upon La substitution as observed from χ (T ) and ρ (T ) measurements. The Kondo temperature T K as calculated from MR measurements is comparable to T N and also decreases with La substitution. The volume dependence of T K is in accordance with the compressible Kondo lattice model and a Doniach diagram of the results is presented. C P(T ) measurements are presented for CePtGa, Ce0.2La0.8PtGa and LaPtGa and the results are discussed in terms of the electronic and magnetic properties. Other features of interest are anomalies in ρ (T ) and C P(T ) due to crystalline electric field effects and metamagnetism as observed in σ (B ) studies for samples with 0≤