Reentrant charge order transition in the extended Hubbard model.

@article{Pietig1999ReentrantCO,
  title={Reentrant charge order transition in the extended Hubbard model.},
  author={Rainer Pietig and Ralf Bulla and Stefan Blawid},
  journal={Physical Review Letters},
  year={1999},
  volume={82},
  pages={4046-4049}
}
We study the extended Hubbard model with both on-site and nearest neighbor Coulomb repulsion ($U$ and $V$, respectively) in the Dynamical Mean Field theory. At quarter filling, the model shows a transition to a charge ordered phase with different sublattice occupancies $n_A \nen_B$. The effective mass increases drastically at the critical $V$ and a pseudo-gap opens in the single-particle spectral function for higher values of $V$. The $V_c(T)$-curve has a negative slope for small temperatures… 

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This study evidences that a finite-range order persists for a wide range of the temperature, as shown by the behavior of the correlation functions and by the two-peak structure exhibited by the charge susceptibility and the entropy.
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