Magnetotransport Properties of Mn2CoSb

So far, only basic magnetic and transport properties of Mn2CoSb Heusler alloy have been reported in the literature. In this work, we investigated magnetotransport properties of melt-spun ribbons of Mn2CoSb. The calculation of normal Hall coefficients R_{0} revealed a dominant role of electrons in electrical transport of the alloy at temperatures below 200 K. At room temperature, the hole-like conductivity predominates. The dependence of the anomalous Hall coefficient R_{S} on electrical resistivity \rho _{xx} , R_{S}\sim \rho _{xx}^{2} , points to the mechanism of the anomalous Hall effect, independent of the concentration of the scatterers. Pronounced hysteretic features of magnetoresistivity \Delta \rho _{xx} were observed upon application and removal of the magnetic field at temperatures below 100 K. It was suggested that the observed hysteresis of \Delta \rho _{xx} is related to a magnetic aftereffect in the region of randomly frozen spin states.