Advertisement

Local environment and electron correlation effects on the magnetic properties of clusters

  • E. Muñoz-Sandoval
  • J. Dorantes-Dávila
  • G.M. Pastor

Abstract:

The electronic and magnetic properties of clusters are investigated in the framework of the Hubbard model by treating electron correlations effects in a saddle-point slave-boson approximation. The size dependent single-particle spectrum is calculated using a third moment real-space expansion of the local density of states. Results for the magnetic moments, magnetic order, average number of double occupations and hopping renormalizations are given as a function of the local coordination number z, for different representative values of the Coulomb interaction strength U/t and band filling n. Several transitions between paramagnetic, ferromagnetic and antiferromagnetic behaviors are obtained as a function of z. The environment dependence of the magnetic behavior and of the degree of electron delocalization is analyzed. Advantages and limitations of the present approach are discussed.

PACS. 36.40.Cg Electronic and magnetic properties of clusters - 71.24.+q Electronic structure of clusters and nanoparticles - 75.10.Lp Band and itinerant models 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Copyright information

© EDP Sciences, Springer-Verlag 1999

Authors and Affiliations

  • E. Muñoz-Sandoval
    • 1
  • J. Dorantes-Dávila
    • 1
  • G.M. Pastor
    • 2
  1. 1.Instituto de Física, Universidad Autónoma de San Luis Potosí, Alvaro Obregón 64, 78000 San Luis Potosí, MexicoMX
  2. 2.Laboratoire de Physique Quantique (Unité mixte de recherche 5626 du CNRS), Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse, FranceFR

Personalised recommendations