Transport Properties of the U1-xThxPt System

V.H. Tran and R. Troć W. Trzebiatowski Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, 50-950 Wrocław, Poland

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We present the results of measurements of electrical resistivity (ρ(T)) and magnetoresistance (Δϱ/ϱ0(T)) on the solid solutions U1-xThxPt (x=0-0.8). The Curie temperature (Tc=21 K) found for the parent compound UPt, is steadily reduced upon the Th-substitution. The ρ(T) and Δϱ/ϱ0(T) functions provide evidence of electron scattering due to spin fluctuations. The most interesting feature of Δϱ/ϱ0 is its high value of about -22% found for UPt and U0.9Th0.1Pt at their Tc and B=8 T. For samples with x ≥ 0.2, the value of Δϱ/ϱ0 at 4 K and 8 T increases with x and becomes positive for Th-composition x >= 0.6.

DOI: 10.12693/APhysPolA.97.399 PACS numbers: 72.15.Eb, 72.15.Gd, 75.70.Pa