Methodological notes

Current status of the Kondo problem

 a, b,  c
a Landau Institute for Theoretical Physics, Russian Academy of Sciences, ul. Kosygina 2, Moscow, 119334, Russian Federation
b Max-Planck Institute of the Physics of Complex Systems, Dresden, Germany
c L.D. Landau Institute for Theoretical Physics, Russian Academy of Sciences, Chernogolovka, Moscow Region, Russian Federation

It is shown that at zero temperature the magnetic field μH"TK does not move the system from the strong coupling to the weak coupling regime. As a result, the average of the impurity spin approaches its saturation value as a power of the small parameter (2TKH)². The study of the high-temperature expansion of the free energy shows that the Kondo problem contains at least two energy scales and that these scales are separated by the coupling constant. The Hamiltonian of the Kondo problem is not renormalizable.

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Fulltext is also available at DOI: 10.1070/PU2001v044n05ABEH000916
PACS: 72.10.Fk, 72.15.Qm, 75.20.Hr (all)
DOI: 10.1070/PU2001v044n05ABEH000916
Citation: Ovchinnikov Yu N, Dyugaev A M "Current status of the Kondo problem" Phys. Usp. 44 541–545 (2001)
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Оригинал: Овчинников Ю Н, Дюгаев А М «Современное состояние проблемы Кондо» УФН 171 565–570 (2001); DOI: 10.3367/UFNr.0171.200105d.0565

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