Abstract
A simple model of charge ordering is considered. It is explicitly shown that at any deviation from half-filling (n≠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.
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From Zhurnal Éksperimental’no\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) i Teoretichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) Fiziki, Vol. 120, No. 2, 2001, pp. 470–479.
Original English Text Copyright © 2001 by Kagan, Kugel, Khomskii.
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Kagan, M.Y., Kugel, K.I. & Khomskii, D.I. Phase separation in systems with charge ordering. J. Exp. Theor. Phys. 93, 415–423 (2001). https://doi.org/10.1134/1.1402742
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DOI: https://doi.org/10.1134/1.1402742