Influence of double occupancy and lattice distortions on the magnetic phase diagram of A{sub 1{minus}x}A{sub x}{sup {prime}}MnO{sub 3}

Journal Article · Fri Jan 01 04:00:00 EST 1999 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.59.1285· OSTI ID:289174

van Veenendaal, M; Fedro, A J ^[1]

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1. Northern Illinois University, De Kalb, Illinois 60115 (United States)

A model is presented that describes the competition between the ferromagnetic and several antiferromagnetic structures observed in the A{sub 1{minus}x}A{sub x}{sup {prime}}MnO{sub 3} series. It is found that the strong asymmetry of the magnetic phase diagram, i.e., predominantly ferromagnetic for x{lt}0.5 and antiferromagnetic for x{gt}0.5, can readily be explained by extending the double exchange model to include double occupancy. The strong charge fluctuations between different MnO{sub 6} clusters are the result of the charge-transfer-like nature of the manganites. The dependence of the magnetic structure on lattice distortions is described. The appearance of different magnetic structures around x=0.5 is interpreted in terms of changes in the Mn-O-Mn bond angle and the Jahn-Teller distortions. {copyright} {ital 1999} {ital The American Physical Society}

• OSTI ID: 289174
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 2 Vol. 59; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
FERROMAGNETIC MATERIALS
JAHN-TELLER EFFECT
MAGNETIC PROPERTIES
MANGANESE OXIDES
PEROVSKITES
PHASE DIAGRAMS