Kondo behaviour of the solid solution (Ce1-xLax)PtGa

The solid solution (Ce1-xLax)PtGa has been studied through X-ray diffraction magnetization (sigma(B)) magnetic susceptibility (/(T)) electrical resistivity (rho(T)) magnetoresistivity (MR) and heat capacity (C(T)) measurements The Neel temperature (T-N = 3 3 K) for CePtGa is lowered upon La substitution as observed from /(T) and rho(T) measurements The Kondo temperature T-K as calculated from MR measurements is comparable to TN 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 Ce-0 La-2(0) 8PtGa and LaPtGa and the results are discussed in terms of the electronic and magnetic properties Other features of interest are anomalies in rho(T) and C-p(T) due to crystalline electric field effects and metamagnetism as observed in sigma(B) studies for samples with 0 <= x <= 0 3 (C) 2010 Elsevier Ltd All rights reserved