Abstract
We consider a large class of models which share the essential features of the Kondo model. Bounds on the susceptibility of the impurity spin are derived as consequences of general inequalities for quantum correlation functions. We also obtain bounds for the spin polarization in the presence of an external field.
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Communicated by J. L. Lebowitz
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Roepstorff, G. Correlation inequalities in quantum statistical mechanics and their application in the Kondo problem. Commun.Math. Phys. 46, 253–262 (1976). https://doi.org/10.1007/BF01609122
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DOI: https://doi.org/10.1007/BF01609122