STABILITY OF SU(N) SYMMETRY IN THE COQBLIN-SCHRIEFFER MODEL BY THE PERTURBATIVE RENORMALIZATION-GROUP

Authors
PAVARINI E ANDREANI LC
Citation
E. Pavarini et Lc. Andreani, STABILITY OF SU(N) SYMMETRY IN THE COQBLIN-SCHRIEFFER MODEL BY THE PERTURBATIVE RENORMALIZATION-GROUP, Physical review. B, Condensed matter, 56(9), 1997, pp. 5073-5076
Citations number
12
Categorie Soggetti
Physics, Condensed Matter
Journal title
Physical review. B, Condensed matter → ACNP
ISSN journal
01631829
Volume
56
Issue
9
Year of publication
1997
Pages
5073 - 5076
Database
ISI
SICI code
0163-1829(1997)56:9<5073:SOSSIT>2.0.ZU;2-G
Abstract
A generalized version of the Coqblin-Schrieffer Hamiltonian for the lo w-temperature behavior of Ce and Yb Kondo systems is studied, in which the SU(N) symmetry in angular momentum space is assumed to be broken by, e.g., splittings in the excited f-impurity configurations. Using t he perturbative renormalization group we show that SU(N) breaking inte ractions scale to weak coupling, and therefore their presence does not alter the low-temperature physics of the model. We also discuss the i nfluence of SU(N) breaking interactions on the Kondo temperature.