Realization of Strong Coupling Fixed Point in Multilevel Kondo Models

Details Realization of Strong Coupling Fixed Point in Multilevel Kondo Models Realization of Strong Coupling Fixed Point in Multilevel Kondo Models

2006-02-12

arxiv.org/abs/cond-mat/0602287v1

Physics

Condensed Matter

Strongly Correlated Electrons

3 pages, 3 figures, for proceedings of ASR-WYP-2005. To be published in Journal of Physical Society Japan supplement

Scientific paper

Impurity four- and six-level Kondo model, in which an ion is tunneling among four- and six-stable points and interacting with surrounding conduction electrons, are investigated by using the perturbative and numerical renormalization group methods. It is shown that purely orbital Kondo effects occur at low temperatures in these systems which are direct generalizations of the Kondo effect in the so-called two-level system. This result offers a good explanation for the enhanced and magnetically robust Sommerfeld coefficient observed in SmOs_4Sb_12 and some other filled-skutterudites.

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