Charge Kondo effect toward a non-Fermi-liquid fixed point in the orbitally degenerate exchange model

Details Charge Kondo effect toward a non-Fermi-liquid fixed point in the orbitally degenerate exchange model Charge Kondo effect toward a non-Fermi-liquid fixed point in the orbitally degenerate exchange model

1999-04-21

arxiv.org/abs/cond-mat/9904292v1

J. Phys. Soc. Jpn. Vol. 68 (1999) 1805

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 2 eps figures, to appear in J. Phys. Soc. Jpn. 68 No.6

Scientific paper

10.1143/JPSJ.68.1805

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.

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