Transport properties of the U1-xThxPt system

We present the results of measurements of electrical resistivity (rho(T)) a nd magnetoresistance (Delta rho/rho(0)(T)) on the solid solutions U1-xThxPt (x = 0-0.8). The Curie temperature (Te = 21 K) found for the parent compou nd UPt, is steadily reduced upon the Th-substitution. The rho(T) and Delta rho/rho(0)(T) functions provide evidence of electron scattering due to spin fluctuations. The most interesting feature of Delta rho/rho(0) is its high value of about -22% found for UPt and U0.9Th0.1Pt at their Te and B = 8 T. For samples with x greater than or equal to 0.2, the value of Delta rho/rh o(0) at 4 K and 8 T increases with x: and becomes positive for Th-compositi on x greater than or equal to 0.6.