Two energy scales and breakdown of renormalizability in the Kondo problem
It is shown that a second energy scale T0 ≫ Tk arises in the Kondo problem. Perturbation theory is valid only in the region T > T0. For this reason, the transition from weak to strong coupling occurs at temperatures much higher than the Kondo temperature Tk.
PACS numbers75.20.Hr 72.10.Fk 72.15.Qm
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