Inhomogeneous charge distributions and phase separation in manganites

M.Yu. Kagan^a, K.I. Kugel’^b
^aP.L. Kapitza Institute for Physical Problems, Russian Academy of Sciences, ul. Kosygina 2, Moscow, 117334, Russian Federation
^bInstitute for Theoretical and Applied Electrodynamics, Russian Academy of Sciences, ul. Izhorskaya 13/19, Moscow, 127412, Russian Federation

Mechanisms of electron phase separation in manganite-type oxide materials are analyzed using a simple Kondo-lattice model with intersite Coulomb repulsion between electrons. This model predicts the instability of magnetic (or charge) homogeneous ordering toward the formation of droplet structures (magnetic polarons) for a wide parameter range in the phase diagram. Various types of magnetic polarons are examined. The transport properties and noise spectrum of phase-separated materials are also discussed.

PACS: 64.75.+g, 71.27.+a, 72.10.−d, 75.30.Vn (all)
DOI: 10.1070/PU2001v044n06ABEH000917
URL: https://ufn.ru/en/articles/2001/6/a/
Web of Science

000173336200001
Citation: Kagan M Yu, Kugel’ K I "Inhomogeneous charge distributions and phase separation in manganites" Phys. Usp. 44 553–570 (2001)

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Оригинал: Каган М Ю, Кугель К И «Неоднородные зарядовые состояния и фазовое расслоение в манганитах» УФН 171 577–596 (2001); DOI: 10.3367/UFNr.0171.200106a.0577