Abstract
Abstract Electrical resistivity ( ρ ) of single crystalline heavy-fermion antiferromagnet UCu 5 Al has been measured under pressure up to P =30 GPa and the magnetoresistance of solid solutions U 1− x Th x Cu 5 Al in magnetic fields up to 14 T. With an increase of P , the Kondo effect develops and the Neel temperature decreases. Near 28 GPa, the magnetic ordering vanishes and ρ exhibits a T 2 -dependence. It is supposed that there exist at least two kinds of magnetic couplings, having different responses to P . The magnetoresistance data reveal the strong influence of Kondo interactions.
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