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We analyze the role that the distance scale ξK0ex0ex=0ex0exvF/TK plays in the single-impurity Kondo problem using renormalization-group-improved perturbation theory. We derive the scaling functions for the local spin susceptibility in various limiting cases. In particular, we demonstrate exactly that the nonoscillating part of it should be short range, i.e., vanish for distances r1/kF, and show explicitly that the interior of the screening cloud does not exhibit weak coupling behavior.
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Barzykin et al. (1996) studied this question.
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