Abstract
The transverse magnetoresistance Δρ(T,H)≡ρ(T,H)-ρ(T,0) has been measured at fixed temperatures in the range 0.5K \\leqslant T \\leqslant 40K as a function of magnetic field H \\leqslant 15T for polycrystalline samples of U6Fe and U6Co, and a single crystal of UPt3 (\\overrightarrowH||\\overrightarrowa and \\overrightarrowH||\\overrightarrowc, \\overrightarrowJ||\\overrightarrowb). The sign of Δρ(T,H) changes from positive to negative as T increases through ∼25K for U6Fe and U6Co, and \\i∼18K for UPt3. At low temperatures the data obey a novel universal form Δρ=AH2/B+H for all three materials, where A and B are T- and H-independent constants. Such behavior is postulated as typical of materials entering a heavy Fermi liquid state at low temperatures.
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