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2000 | 97 | 3 | 385-388
Article title

Coqblin-Schrieffer Impurity with Local Exchange Coupling: a Perturbative Approach

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EN
Abstracts
EN
The Coqblin-Schrieffer one-impurity model with the additional local exchange interaction is studied within diagrammatic approach. The Ruderman-Kittel-Kasuya-Yoshida-type local exchange interaction between f electrons of the impurity and a channel of conduction electron l=0 partial waves is treated in the molecular field approximation. The perturbation expansion resummation for the Coqblin-Schrieffer hybridization mediated interaction vertex part is carried out in the ladder approximation yielding the formula for the Kondo temperature T_{K} decreasing with increased local exchange. Moreover, the temperature divergence of the susceptibility at T_{K} is shifted towards T=0. For some critical strength of the local exchange interaction the susceptibility approaches a Curie-type dependence as for an uncompensated impurity magnetic moment. A relation to the "Kondo disorder" model, which leads to the non-Fermi-liquid behavior, is discussed.
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Year
Volume
97
Issue
3
Pages
385-388
Physical description
Dates
published
2000-03
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Publication order reference
YADDA identifier
bwmeta1.element.bwnjournal-article-appv97z306kz
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