  La2Au2Cd and Ce2Au2Cd were prepared from the elements by reactions in sealed
tantalum tubes in a water-cooled sample chamber of an induction furnace. These
intermetallics crystallize with the tetragonal Mo2FeB2 type, space group
P4/mbm. While La2Au2Cd is Pauli paramagnetic, Ce2Au2Cd shows Curie-Weiss
behaviour above 100 K with an experimental magnetic moment of 2.41(2) muB/Ce
atom, indicating trivalent cerium. Antiferromagnetic ordering is detected for
Ce2Au2Cd at 5.01(2) K and magnetization measurements reveal a metamagnetic
transition at 3 K at a critical field of around 20 kOe with a saturation moment
of 1.50(2)muB/Ce atom at 80 kOe. The low-temperature heat capacity properties
characterize Ce2Au2Cd as a heavy fermion material with an electronic specific
heat coefficient (gamma) = 807(5) mJ/mol K2 as compared to La2Au2Cd with gamma
= 6(5) mJ/mol K2.
