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J. Kudrnovsky, V. Drchal, I. Turek, P. Weinberger:
"Electronic, magnetic, and transport properties and magnetic phase transition in quaternary (Cu,Ni)MnSb Heusler alloys";
Physical Review B, 78 (2008), 0544411 - 0544418.

The electronic properties, finite-temperature magnetism, and transport properties of semi-Heusler quaternary
alloys Cu,Ni MnSb are studied theoretically by means of ab initio calculations as a function of the alloy
composition. As documented by experiment, the transition from the ferromagnetic state NiMnSb to the
antiferromagnetic state CuMnSb gives rise to an abrupt change in the magnetic moments and resistivities at
about xCu 0.7, while the Curie temperature exhibits a smooth behavior with the Cu content. We explain this
peculiar behavior with the onset of disorder in orientations of the Mn spins at xCu 0.7. A simple account of
magnetic disorder based on the so-called uncompensated disordered local-moment picture provides a good
quantitative understanding of available experimental data. An origin of the observed magnetic phase transition
is also discussed.\