Abstract
We have observed large variations of the Hall effect in the vicinity of magnetic phase transition points. Sharp peaks near the spin-reorientation and Curie temperatures are observed in Hall effect data from ${\mathrm{Nd}}_{2}{\mathrm{Fe}}_{14}\mathrm{B}$ single crystals. The effect is very sensitive to the applied magnetic field direction near the spin-reorientation temperature. Away from these critical regions the Hall resistivity is proportional to the square of the total resistivity. Different scattering mechanisms dominate in different regions.
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