Low-temperature properties of CeTAl3 (T = Au, Cu, Pt) and CeAuGa3

Measurements of the magnetization, specific heat, and electrical resistivit y on CeTAl3 (T = Au, Cu, Pt) and CeAuGa3 polycrystals are reported For all alloys, magnetic order is found. In CeTAl3 the antiferromagnetic ordering t emperature T-N increases from 1.5 K (T = Au) to 2.9 K (T = Cu) while spin-g lass order is found at 0.8 K for T = Pt. This tendency resembles the nonmon otonic dependence of the ordering temperature on the hybridization between Ce moments and ligand atoms in terms of the Doniach picture. CeAuGa3 (T-N = 2.4 K) behaves similarly to CeAuAl3, thus underscoring the dominant role o f transition metal ligands in ternary Ce compounds.