Spl (2,1) dynamical supersymmetry and suppression of ferromagnetism in flat-band double-exchange models

K. Penc, R. Lacaze

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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 spl(2,1) algebra properties in the strong coupling limit. The ferromagnetic ground state is realized for 1 and N+l 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.

Original languageEnglish
Pages (from-to)561-567
Number of pages7
JournalEurophysics Letters
Issue number5
Publication statusPublished - Dec 1 1999


ASJC Scopus subject areas

  • Physics and Astronomy(all)

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