Journal
JOURNAL OF EXPERIMENTAL AND THEORETICAL PHYSICS
Volume 93, Issue 2, Pages 415-423Publisher
PLEIADES PUBLISHING INC
DOI: 10.1134/1.1402742
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A simple model of charge ordering is considered. It is explicitly shown that at any deviation from half-filling (n not equal 1/2), the system is unstable with respect to the phase separation into the charge ordered regions with n = 1/2 and the metallic regions with a smaller electron or hole density. A 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. The analysis of this extended model allows us to determine the magnetic structure of the phase-separated state and to reveal the characteristic features of the manganites and other substances with charge ordering. (C) 2001 MAIK Nauka/Interperiodica.
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