We report on measurements of specific heat and resistivity for the series of compounds $\left({\mathrm{La}}_{1-x}{\mathrm{Ce}}_x\right){\mathrm{Pd}}_2{\mathrm{Al}}_3,$ for $0<~x<~1.$ The chemical substitution with La promotes an increase of the unit cell volume, which is responsible for the changes observed for the ground state of the system. The resistivity results show two distinct behaviors: the Kondo single impurity for low Ce concentration and the Kondo lattice regime for the other end. From the magnetic specific heat results we estimated the Kondo temperature ${(T}_K).\mathrm{}$ Our results show that $T_K$ increases monotonously with Ce concentration but with a strong variation of the Néel temperature. We also estimated the $s-f$ exchange parameter and density of states for the whole series of compounds. A Doniach type diagram is presented including the literature data obtained from pressure experiments.

• Received 22 September 1998

DOI:https://doi.org/10.1103/PhysRevB.59.8738