Abstract
Magnetic properties and Curie temperatures of semi-Heusler alloys Cu1−x Ni x MnSb are calculated as a function of the alloy composition. The transition from the ferromagnetic state (NiMnSb) to the antiferromagnetic state (CuMnSb) gives rise to an abrupt change in the concentration dependence of alloy magnetization at about x Cu = 0.7 while the Curie temperature decreases monotonically with the Cu-content. Such behaviour can be understood as being due to the onset of disorder in orientations of Mn-spins at x Cu = 0.7. A simple account of magnetic disorder as based on the uncompensated disorder local moment picture provides also a good quantitative understanding of available experimental data.
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