Abstract
The NMR and magnetic susceptibility of the intermetallic pseudo-binary compounds Ce 1− x Gd x Al 3 ( x=0·01; 0·03; 0·05; 0·07), Ce 0·95Tb 0·05Al 3 and Ce 0·975Er 0·025Al 3 were investigated. The susceptibility is given by the sum of a temperature independent term and a Curie-Weiss one. The last one results from the contribution of the localized free-ion magnetic moments of all the rare-earth ions which are also responsible for the strong temperature dependent Knight shifts of the NMR lines of 27Al nuclei via the exchange polarization of the conduction electrons. The 27Al NMR spectra exhibit besides the line due to Al sites surrounded in the first coordination sphere as in CeAl 3 a second peak with a lower Knight shift due to Al nuclei positioned in the vicinity of a Gd, Tb or Er ion.
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