Antiferromagnetic ordering in heavy fermion system Ce2Au2Cd

Details Antiferromagnetic ordering in heavy fermion system Ce2Au2Cd Antiferromagnetic ordering in heavy fermion system Ce2Au2Cd

2005-09-27

arxiv.org/abs/cond-mat/0509703v2

Physics

Condensed Matter

Materials Science

Accepted for publication in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.72.214435

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.

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