Springer LINK: The European Physical Journal B - Abstract Volume 5 Issue 3 (1998) pp 457-464

The European Physical Journal B

ISSN: 1434-6028 (printed version)
ISSN: 1434-6036 (electronic version)

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Abstract Volume 5 Issue 3 (1998) pp 457-464

Perturbative renormalization of multi-channel Kondo-type models

Y. Kuramoto (a)

Department of Physics, Tohoku University, Sendai 980-77, Japan

Received: 24 February 1998 / Accepted: 17 April 1998

Abstract: 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)$\times$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 Ce_xLa_1-xB₆ is discussed.

PACS. 05.30.-d Quantum statistical mechanics - 05.70.Jk Critical point phenomena

(a) email: kuramoto@cmpt01.phys.tohoku.ac.jp

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