Magnetic behaviour of U1-xGdxLaAl4 system

The magnetic properties of the U1-xGdxLaAl4 system were investigated in the 4-600 K temperature range and fields up to 8 T. The ULaAl4 compound shows magnetic behaviour typical for a spin fluctuations system. When uranium is replaced by gadolinium magnetic ordering is evidenced. In the paramagnetic region the susceptibilities follow a Curie-Weiss type behaviour. For increa sing gadolinium content a decrease of the effective uranium magnetic moment s was observed. This behaviour was attributed to a gradual quenching of spi n fluctuations by the internal field. (C) 1999 Elsevier Science S.A. All ri ghts reserved.