New solid solutions Cu 2 Mn x Fe 1Àx SnS 4 were prepared by direct combination of the corresponding elements at 850 8C. The crystal structure of Cu 2 Mn 0.4 Fe 0.6 SnS 4 was determined by single-crystal X-ray diffraction. This phase is described in the space group I 42m where each cation is tetrahedrally coordinated to four sulfur anions in a sphalerite-like arrangement. The XRD patterns of the solid solutions Cu 2 Mn x-Fe 1Àx SnS 4 were fully indexed in the space group I 42m and the values of the cell parameter for all phases obey the usual linear Vegard behavior. A progressive evolution of the magnetic moment in the paramagnetic state is observed when increasing the content of manganese. The negative values of the Curie-Weiss constant, u, indicate an antiferromagnetic (AF) behavior with AF interactions, weaker by more than one order of magnitude compared to other diluted magnetic semiconductors (DMSs) with zinc-blende or wurzite crystal structure.
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