Perturbative renormalization of multi-channel Kondo-type models*
Department of Physics, Tohoku University, Sendai 980-77, Japan
Corresponding author: a firstname.lastname@example.org
Accepted: 17 April 1998
Published online: 15 October 1998
The poor man's scaling is extended to higher order by the use of the open-shell Rayleigh-Schrödinger perturbation theory. A generalized Kondo-type model with the SU(n)×SU(m) symmetry is proposed and renormalized to the third order. It is shown that the model has both local Fermi-liquid and non-Fermi-liquid fixed points, and that the latter becomes unstable in the special case of n=m=2. Possible relevance of the model to the newly found phase IV in CexLa1-xB6 is discussed.
PACS: 05.30.-d – Quantum statistical mechanics / 05.70.Jk – Critical point phenomena
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 1998