The Knight shift of the NMR of 27 Al and the susceptibilities of the compounds LaAl, GdAl, TbAl, DyAl, HoAl, and ErAl have been measured in dependence on temperature. The results are discussed in terms of the Ruderman‐Kittel‐Kasuya‐Yosida theory. The exchange integral γ between conduction electrons and 4f electrons is found to be −0.39 eV.
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Diepen et al. (1968) studied this question.
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