| Issue |
Europhys. Lett.
Volume 48, Number 5, December 1999
|
|
|---|---|---|
| Page(s) | 561 - 567 | |
| Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
| DOI | https://doi.org/10.1209/epl/i1999-00520-y | |
| Published online | 01 September 2002 | |
dynamical supersymmetry and suppression of ferromagnetism in flat-band double-exchange models
1
Service de Physique Théorique, CEA-Saclay - 91191 Gif-sur-Yvette Cedex, France
2
ASCI, Bât. 506, Université Paris Sud - 91405 Orsay Cedex, France
Received:
28
April
1999
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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