A zero-temperature magnetic susceptibility of a localized spin antiferromagnetically exchange-coupled with the conduction electrons is calculated on the basis of the model in which a singlet bound state is formed between the localized spin and the conduction electrons. The obtained susceptibility is given by µB2/|| where denotes the binding energy. It is shown that this result holds in any stage of approximation.
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Ishii et al. (1967) studied this question.