Frustration-induced non-Fermi-liquid behavior in a three-impurity Kondo model

Details Frustration-induced non-Fermi-liquid behavior in a three-impurity Kondo model Frustration-induced non-Fermi-liquid behavior in a three-impurity Kondo model

1996-07-26

arxiv.org/abs/cond-mat/9607190v1

Physics

Condensed Matter

RevTex, 4 pages, 1 epsf-embedded EPS figure

Scientific paper

A Kondo model for three spin-one-half impurities placed at the vertices of an equilateral triangle is studied using the numerical renormalization-group method. The impurity spins can form two frustrated doublets which, because of the rotation symmetry, couple equally to the conduction band. Over a broad range of antiferromagnetic RKKY interaction strengths, this degeneracy drives the system to one of two novel, non-Fermi-liquid fixed points. Potential scattering is a relevant perturbation at one of these fixed points, but is marginal throughout the second regime.

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