HALL-EFFECT IN HEAVY-FERMION SYSTEMS - UPT3, UAL2, CEAL3, CERU2SI2

Hall-effect measurements are presented on four heavy-fermion systems: UPt//3, UAl//2, CeAl//3, CeRu//2Si//2. We show that the Hall effect is primarily due to skew scattering. At low temperature the Hall constant increases rapidly above its residual value and is associated with the development of skew scattering by fluctuations about the coherent state. At high temperatures, in the regime of incoherent resonant scattering, the Hall effect is accounted for properly by single-impurity models of skew scattering.