Abstract
The system exhibits an unconventional Kondo effect with non-Fermi-liquid characteristics at low temperatures for . Measurements of the low-temperature electrical resistivity and magnetization of high-purity samples with have been made as part of an effort to determine whether the non-Fermi-liquid behaviour persists to low U concentrations, i.e., whether it is a single-ion effect. Irreversible behaviour in the magnetization, reminiscent of spin glass freezing, is observed for samples with , while long-range antiferromagnetic ordering has previously been established by neutron diffraction measurements for a sample with x = 0.45. Magnetic relaxation, ac magnetic susceptibility, and specific heat measurements were performed to investigate this unusual magnetic ordering.
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