Antiferromagnetic ordering in the heavy-fermion system Ce2Au2Cd

[摘要] 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 behavior above 100 K with an experimental magnetic moment of 2.41(2) mu(B)/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) mu(B)/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 K-2 as compared to La2Au2Cd with gamma=6(5) mJ/mol K-2.

[发布日期] 2005-12-01

[关键词] LOW-TEMPERATURE PROPERTIES;U(2)T(2)X COMPOUNDS;CRYSTAL-STRUCTURES;T=NI;PD;BEHAVIOR;CE2T2IN;PR;RE;LA