Abstract
The low temperature heat capacity and magnetic susceptibility were measured on alloys of the Gd 3Pd 4 and Gd 4Pd 5 compositions. The Gd 4Pd 5 sample was found to be a two phase alloy consisting of Gd 3Pd 4 and Gd 3Pd 4-GdPd eutectic. The Gd 3Pd 4 compound was confirmed to be antiferromagnetic with a Néel temperature of 18 K. Another magnetic transition was observed ≈ 6K which has characteristics of ferromagnetic or ferromagnetic ordering. In applied magnetic fields up to 9.85 T, a heat capacity peak developed at ≈ 13 K while the 18 K peak shifted to lower temperatures in fields > 5.3 T. The entropy associated with the 13 K anomaly was estimated to be less than 2% of total magnetic entropy. The origin of this anomaly was thought to be due to some type of spin reorientation of some (few) of the antiferromagnetic moments in the applied field. The low temperature heat capacities of La 3Pd 4 and Lu 3Pd 4 were also measured. The electronic specific heat coefficients were found to be 10.5 and 5.72 mJ/mol K 2, respectively, and the Debye temperatures are 171 and 191 K, respectively.
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