Phase separation in inhomogeneous mixed-valence systems
Journal Article
·
· Physical Review, B: Condensed Matter
- Department of Physics, Florida State University, Tallahassee, Florida 32306 (United States)
A simple alloy-analogy model for inhomogeneous mixed-valence systems is considered in the context of manganites. It is assumed that the Mn ions coexist in two magnetic configurations, Mn{sup 4+} and Mn{sup 3+}, and that they interact via a nearest-neighbor charge interaction. In addition, two nearest-neighbor ions with equal valence interact antiferromagnetically (superexchange), while ions of different valence are coupled ferromagnetically (double exchange). Assuming classical spins, we show that the system is unstable to phase separation, i.e., to the coexistence of antiferromagnetic and charge ordered ferromagnetic domains. {copyright} {ital 1999} {ital The American Physical Society}
- OSTI ID:
- 337547
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 17 Vol. 59; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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