3d transition-metal intercalates of the niobium and tantalum dichalcogenides. II. Transport properties

The Hall coefficient and resistivity of the first-row transition-metal intercalates, M1/3TaS2 (M = V, Cr, Mn, Fe, Co, Ni), Mnl/4TaS2, M1/3NbS2 (M = V, Cr) and Fel/4NbSe2 have been measured as a function of temperature. These intercalation complexes show either ferromagnetic or antiferromagnetic orderings and there are large anomalies in both transport properties at the respective magnetic-ordering temperatures. The Hall coefficient in the ferromagnetic intercalates varies linearly with the magnetic susceptibility for temperatures above the Curie temperature, Tc, and as the square of the resistivity for temperatures below Tc. We have observed that the Hall coefficient of Fe1/3TaS2 varies non-linearly with the applied field near the Curie temperature. We have found a similar variation of the spin-disorder resistivities of the complexes, M1/3TaS2 and M1/3NbS2 (M = Mn, Fe, Co, Ni) with the intercalate ion.