Abstract
We have studied the magnetic properties of GdT 4Al 8 and GdT 6Al 6 compounds with T=Cr, Mn, Cu by means of standard magnetization and susceptibility measurements, magnetization measurements in high fields up to 35 T, and measurements of the specific heat. In these GdT 4Al 8 compounds, the T element does not carry a magnetic moment. In all these cases, the coupling between the Gd moments is fairly weak and leads to antiferromagnetic ordering at rather low temperatures. We have analyzed our data in terms of a simple mean-field two-sublattice model. Reliable values of the intersublattice coupling strength were derived from high-field measurements made on free powder particles. In the GdT 6Al 6 compounds, more than one crystallographic site is occupied by the T elements, leading to relatively strong changes in the magnetic ordering temperatures. A comparison is made with the magnetic properties of GdFe 4Al 8 and GdFe 6Al 6 compounds in which the Fe moments strongly determine the magnetic properties. High-field measurements are presented also for the latter two compounds.
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