Spin Density Waves in Dimerized Systems

  • S. Caprara
  • M. Avignon
  • O. Navarro

Abstract

We study the effect of strong electronic correlations in the presence of chemically-induced charge transfer. We consider the Hubbard model at half-filling with an external staggered field as the simplest model to investigate the condition for the existence of a spin density wave competing with a charge density wave. The slave-boson approach is used to treat the electronic correlations in the strong coupling regime. We also consider the effect of a Brillouin-zone boundary phonon via a dimerization of the hopping term, thus introducing a competition with a paramagnetic bond-alternating phase and determine the phase diagram.

Keywords

Hubbard Model Charge Density Wave Spin Density Wave Dimerized System Strong Electronic Correlation 
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References

  1. 1.
    S. Caprara, M. Avignon, and O. Navarro, unpublished.Google Scholar
  2. 2.
    A similar model, where however the direct effect of U on the charge-density-wave amplitude was prevented by subtracting the Hartree contribution in the U term, was studied in V. Tugushev, S. Caprara, and M. Avignon, Phys. Rev. B 54 5466 (1996).Google Scholar
  3. 3.
    S. E. Barnes, J. Phys. F 6, 1375 (1976); P. Coleman, Phys. Rev. B 29, 3035 (1984).Google Scholar
  4. 4.
    G. Kotliar and A. R. Ruckenstein, Phys. Rev. Lett. 57, 1362 (1986);we refer to this paper for any detail about the SB technique on a bipartite lattice.Google Scholar

Copyright information

© Springer Science+Business Media New York 1998

Authors and Affiliations

  • S. Caprara
    • 1
  • M. Avignon
    • 1
  • O. Navarro
    • 2
  1. 1.Laboratoire d’Etudes des Propriétés Electroniques des SolidesCentre National de la Recherche ScientifiqueGrenoble Cedex 9France
  2. 2.Instituto de Investigaciones en MaterialesUniversidad Nacional Autónoma de MéxicoMéxico D. F.Mexico

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