Phase separation in systems with charge ordering

Details Phase separation in systems with charge ordering Phase separation in systems with charge ordering

2000-01-18

arxiv.org/abs/cond-mat/0001245v4

Physics

Condensed Matter

Strongly Correlated Electrons

9 pages, revtex

Scientific paper

10.1134/1.1402742

A simple model of charge ordering is considered. It is shown explicitly that at any deviation from half-filling ($n \neq 1/2$) the system is unstable with respect to phase separation into charge ordered regions with $n = 1/2$ and metallic regions with smaller electron or hole density. Possible structure of this phase-separated state (metallic droplets in a charge-ordered matrix)is discussed. The model is extended to account for the strong Hund-rule onsite coupling and the weaker intersite antiferromagnetic exchange. An analysis of this extended model allows us to determine the magnetic structure of the phase-separated state and to reveal the characteristic features of manganites and other substances with charge ordering.

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