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

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