HALL-EFFECT IN Y1-XUXPD3 AND CENI2GE2

We have investigated the Hall effect in Y1-xUxPd3 and CeNi2Ge2, both o f which are reported to exhibit so-called non-Fermi-liquid behavior. T he Hall coefficient R-H of Y1-xUxPd3 first increases with decreasing t emperature and tends to saturate at lower temperatures for small x, as expected from the ordinary skew scattering contribution. With increas ing x, an increase of R-H at low temperatures becomes evident, and fin ally for x=0.3 it shows a faint peak near 2 It reflecting a spin-glass transition. At a critical concentration x similar to 0.2, it varies l inearly as - log(T) below similar to 40 K. The anomalous R-H in CeNi2G e2 is found to be negative and anisotropic, in contrast with that in C eRu2Si2. At low temperatures, we found a breakdown of the sealing rela tion between RH and the resistivity (rho), i.e., R(H)similar to rho(2) , reported to be fulfilled in several heavy fermion compounds includin g CeRu2Si2. We found that R(H)proportional to ln(rho) is fulfilled ove r the wider temperature range of 0.5-15 K.