Charge Kondo effect toward a non-Fermi-liquid fixed point in the orbitally degenerate exchange model
Abstract
We show that a Kondo-type model with an orbital degeneracy has a new non-Fermi-liquid fixed point. Near the fixed point the spin degrees of freedom are completely quenched, and the residual charge degrees of freedom lead to the multi-channel Kondo effect. Anomalous behavior appears in electric and thermal properties, but the magnetic susceptibility should show the local Fermi-liquid behavior. The non-Fermi-liquid fixed point becomes unstable against perturbations breaking the particle-hole symmetry. We derive these results using the third-order scaling for a spherically symmetric model with a fictitious spin. In contrast to the Coqblin-Schrieffer model, the present model respects different time-reversal properties of multipole operators.
Keywords
Cite
@article{arxiv.cond-mat/9904292,
title = {Charge Kondo effect toward a non-Fermi-liquid fixed point in the orbitally degenerate exchange model},
author = {Hiroaki Kusunose and Yoshio Kuramoto},
journal= {arXiv preprint arXiv:cond-mat/9904292},
year = {2009}
}
Comments
4 pages, 2 eps figures, to appear in J. Phys. Soc. Jpn. 68 No.6