Anisotropic Kondo Resistance in Fe Doped

The resistivity and magnetoresistivity of NbSe2 single crystals doped with iron have been measured in the temperature range 1–70 K. The crystals were grown with iron concentrations ranging from 0.25% to 5.0% and in zero magnetic field a strong resistance minimum is observed in the 10–15 K range followed by a relative maximum in the 1–5 K range. For magnetic fields perpendicular to the layers the increase in resistivity below the minimum is enhanced while for magnetic fields parallel to the layers the resistivity increase can be completely quenched. The detailed behavior is dependent on the iron concentration and has been studied in fields up to 151 kOe. Hysteresis in the temperature dependent resistivity has been observed and along with other effects suggests that some spin ordering may take place.