through Magnetotransport*

Intercalation of magnetic ions into highly-correlated electron systems often leads to novel properties emerging from the interactions between magnetism and other order parameters, such as superconductivity. Here, magnetotransport properties of Fe_2.5%TaSe₂ have been measured as functions of both temperature and field, across a range of pressure. The Fe-doped compound exhibits an overall negative magnetoresistance, in contrast to the positive magnetoresistance of the pure TaSe₂ compound. In addition, an anomalous magnetic hysteresis is present in the doped sample at 2 K. Lastly, under pressure the Kondo effect, driven by spin-spin scattering at dopant sites, gives way to superconductivity.