Electrical resistivity and thermopower of Nd1-xTbxCo2 compounds

Electrical resistivity rho and thermopower S of Nd1-xTbxCo2 Laves phase quasibinary alloys (0 <= x <= 1) are investigated at temperatures from 2 K to 300 K. The magnetic transition temperature T-C, determined from resistivity magnetic anomaly, increases linearly with increasing x. The low temperature thermopower changes its sign from negative to positive at the critical composition where the relative orientation of total magnetization and cobalt 3d moment is changed. We propose that this change is related to the dependence of s-d scattering rate on relative polarization of conduction electrons and cobalt 3d band.