The effects of the next-nearest-neighbour density–density interaction in the atomic limit of the extended Hubbard model

@article{Kapcia2011TheEO,
  title={The effects of the next-nearest-neighbour density–density interaction in the atomic limit of the extended Hubbard model},
  author={Konrad Jerzy Kapcia and Stanisław Robaszkiewicz},
  journal={Journal of Physics: Condensed Matter},
  year={2011},
  volume={23},
  pages={105601}
}
We have studied the extended Hubbard model in the atomic limit. The Hamiltonian analysed consists of the effective on-site interaction U and the intersite density–density interactions Wij (both nearest-neighbour and next-nearest-neighbour). The model can be considered as a simple effective model of charge ordered insulators. The phase diagrams and thermodynamic properties of this system have been determined within the variational approach, which treats the on-site interaction term exactly and… 

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