  
|
    
|
Zeitschrift für Physik B Condensed Matter
ISSN: 0722-3277 (printed version)
ISSN: 1431-584X (electronic version)
Abstract Volume 103 Issue 2 (1997) pp 259-261
Supersymmetric approach to heavy-fermion systems
C. Pépin, M. Lavagna
Commissariat à l'Energie Atomique, Département de Recherche Fondamentale sur la Matière Condensée/SPSMS, 17, rue des Martyrs, F-38054 Grenoble Cedex 9, France (Fax: 0033-04-76-885109, e-mail: {pepin,lavagna}@drfmc.ceng.cea.fr)
Abstract. We present a new supersymmetric approach to the Kondo lattice model in order to describe simultaneously the quasiparticle excitations and the low-energy magnetic fluctuations in heavy-Fermion systems. This approach mixes the fermionic and the bosonic representation of the spin following the standard rules of superalgebra. Our results show the formation of a bosonic band within the hybridization gap reflecting the spin collective modes. The density of states at the Fermi level is strongly renormalized while the Fermi surface sum rule includes nc+1 states. The dynamical susceptibility is made of a Fermi liquid superimposed on a localized magnetism contribution.
PACS: 72.15.Qm; 75.20.Hr; 75.30.Mb; 75.40.Gb
Article in PDF-Format
Article in (gzipped) PS-Format
Last change: May 27, 1997
helpdesk@link.springer.de
© Springer Berlin Heidelberg 1997