Abstract
The heat capacity, magnetic susceptibility and magnetization of Y 1− x U x Rh 4B 4 were determined within the range from x = 0 to x = 0.65. The influence of the local magnetic moments of the U atoms (d U-U = 5.27 A ̊ ) in the CeCo 4B 4 structure of the tetragonal RERh 4B 4 was studied. A.c. susceptibility measurements showed a rather large value for the T c depression of d T c/d x = −1.88 K per at. % U in the lower concentration range x = 0.0 to x = 0.06. In comparison with the (Bardeen-Cooper-Schrieffer) BCS theory and the Abrikosov-Gorkov model for dilute magnetic impurities, the decrease in the jump in specific heat at T c vs. the depression of T c is rather strong in these samples, so the existence of a demagnetizing Kondo cloud around the U moments seems likely. In the samples containing more U, the magnetization and d.c. susceptibility showed a tendency towards magnetic behaviour, but no evidence for long-range magnetic order was found.
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