Charge ordering and phase separation in the infinite dimensional extended Hubbard model

Details Charge ordering and phase separation in the infinite dimensional extended Hubbard model Charge ordering and phase separation in the infinite dimensional extended Hubbard model

2004-03-06

arxiv.org/abs/cond-mat/0403188v1

Phys. Rev. B 70, 085118 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

9 pages, 7 figures, submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.70.085118

We study the extended Hubbard model with both on-site (U) and nearest neighbor (V) Coulomb repulsion using the exact diagonalization method within the dynamical mean field theory. For a fixed U (U=2.0), the T-n phase-diagrams are obtained for V=1.4 and V=1.2, at which the ground states of n=1/2 system is charge-ordered and charge-disordered, respectively. In both cases, robust charge order is found at finite temperature and in an extended filling regime around n=1/2. The order parameter changes non-monotonously with temperature. For V=1.4, phase separation between charge-ordered and charge-disordered phases is observed in the low temperature and n < 0.5 regime. It is described by an "S"-shaped structure of the n-/mu curve. For V=1.2, the ground state is charge-disordered, and a reentrant charge-ordering transition is observed for 0.42 < n < 0.68. Relevance of our results to experiments for doped manganites is discussed.

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