Non-Fermi liquid behavior in an extended Anderson model

Details Non-Fermi liquid behavior in an extended Anderson model Non-Fermi liquid behavior in an extended Anderson model

1996-08-27

arxiv.org/abs/cond-mat/9608128v1

Physics

Condensed Matter

REVTEX, 17 pages, no figures, to be published in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.54.15185

An extended Anderson model, including screening channels (non-hybridizing, but interacting with the local orbit), is studied within the Anderson-Yuval approach, originally devised for the single-channel Kondo problem. By comparing the perturbation expansions of this model and a generalized resonant level model, the spin-spin correlation functions are calculated which show non-Fermi liquid exponent depending on the strength of the scattering potential. The relevance of this result to experiments in some heavy fermion systems is briefly discussed.

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