Zero-Temperature Susceptibility of a Localized Spin Exchange Coupled with the Conduction Electrons

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Abstract
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/|\tildeE| where \tildeE denotes the binding energy. It is shown that this result holds in any stage of approximation.