Volume 48, Number 5, December 1999
|Page(s)||561 - 567|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
dynamical supersymmetry and suppression of ferromagnetism in flat-band double-exchange models
Service de Physique Théorique, CEA-Saclay - 91191 Gif-sur-Yvette Cedex, France
2 ASCI, Bât. 506, Université Paris Sud - 91405 Orsay Cedex, France
Accepted: 30 September 1999
The low-energy spectrum of the ferromagnetic Kondo lattice model on an N-site complete graph extended with on-site repulsion is obtained from the underlying algebra properties in the strong coupling limit. The ferromagnetic ground state is realized for 1 and N+1 electrons only. We identify the large density of states to be responsible for the suppression of the ferromagnetic state and argue that a similar situation is encountered in the Kagomé, pyrochlore, and other lattices with flat bands in their one-particle density of states.
PACS: 71.27.+a – Strongly correlated electron systems; heavy fermions / 75.30.Mb – Valence fluctuation, Kondo lattice, and heavy-fermion phenomena / 03.65.Fd – Algebraic methods
© EDP Sciences, 1999
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