Abstract
In this letter, the effects of Mn doping on the magnetic properties, resistivity, and magnetoresistance of FeCr2−xMnxS4 (0⩽x⩽0.1) are reported. Both the Curie temperature Tc and the maximum value of the magnetization increase with Mn content, rather than decrease as found in the cases of substituting nonmagnetic ions for Cr. These effects are attributed to the fact that Mn participates in the magnetic interaction networks and strengthens the magnetism of the Cr sublattice. Interestingly, it is found that the resistivity decreases while the maximum magnetoresistance increases and shifts to higher temperature with increasing doping level. These are discussed in the context that more itinerant eg electrons are introduced with substitution of Mn for Cr.
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