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Title: Phase separation in inhomogeneous mixed-valence systems: Application to manganites

Abstract

Manganites are inhomogeneous mixed-valence systems in which the Mn ions coexist in two magnetic configurations, Mn{sup 4+} and Mn{sup 3+}. We consider a simple alloy-analogy model with a charge interaction between nearest neighbor Mn ions. In addition there is an antiferromagnetic (AF) (superexchange) interaction between nearest neighbor ions of equal valence, while ions of different valence are coupled ferromagnetically (FM) (double exchange). Assuming classical spins, we show that the system is unstable to phase separation, i.e., to the coexistence of AF and charge ordered FM domains. In a magnetic field the FM domains increase at the expense of the AF ones. (c) 2000 American Institute of Physics.

Authors:
 [1]
  1. Department of Physics, Florida State University, Tallahassee, Florida 32306 (United States)
Publication Date:
OSTI Identifier:
20216218
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 87; Journal Issue: 9; Other Information: PBD: 1 May 2000; Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; LANTHANUM OXIDES; CALCIUM OXIDES; MANGANESE OXIDES; PHASE STABILITY; ANTIFERROMAGNETIC MATERIALS; EXCHANGE INTERACTIONS; DOMAIN STRUCTURE; THEORETICAL DATA

Citation Formats

Schlottmann, P. Phase separation in inhomogeneous mixed-valence systems: Application to manganites. United States: N. p., 2000. Web. doi:10.1063/1.373235.
Schlottmann, P. Phase separation in inhomogeneous mixed-valence systems: Application to manganites. United States. doi:10.1063/1.373235.
Schlottmann, P. Mon . "Phase separation in inhomogeneous mixed-valence systems: Application to manganites". United States. doi:10.1063/1.373235.
@article{osti_20216218,
title = {Phase separation in inhomogeneous mixed-valence systems: Application to manganites},
author = {Schlottmann, P.},
abstractNote = {Manganites are inhomogeneous mixed-valence systems in which the Mn ions coexist in two magnetic configurations, Mn{sup 4+} and Mn{sup 3+}. We consider a simple alloy-analogy model with a charge interaction between nearest neighbor Mn ions. In addition there is an antiferromagnetic (AF) (superexchange) interaction between nearest neighbor ions of equal valence, while ions of different valence are coupled ferromagnetically (FM) (double exchange). Assuming classical spins, we show that the system is unstable to phase separation, i.e., to the coexistence of AF and charge ordered FM domains. In a magnetic field the FM domains increase at the expense of the AF ones. (c) 2000 American Institute of Physics.},
doi = {10.1063/1.373235},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 9,
volume = 87,
place = {United States},
year = {2000},
month = {5}
}