Electrical and Hall Resistivity in Rare Earth Intermetallic Compounds RAg_1−xIn_x (R: Gd, Tb and Dy)

Abstract

The electrical resistivity and the Hall resistivity in polycrystalline specimens of RAg_1−xIn_x have been measured from 4.2 K to room temperature and the paramagnetic region up to room temperature, respectively. The spin disorder resistivity at 0 K, ρ_m(0), takes a maximum near the boundary of the different magnetic structures in each compound system, and that above the Curie temperature, ρ_m(∞), increases with x in Gd system, while it takes a maximum around x=0.3 in Tb and Dy systems. The ordinary Hall coefficient, R₀, is positive for all the compounds. On the other hand, the spontaneous Hall coefficient, R_s, is negative for all the compounds except GdAg and TbAg and its magnitude increases with x for x≥0.1 in all the systems. The results have been discussed on the basis of the localized spin model.