Magnetic phase transitions in the system La1−xBixMnO3+λ

The crystal structure and magnetic properties of the La1−xBixMnO3+λ system (0⩽x⩽1;λ⩽0.08) are studied as functions of the oxygen and bismuth contents. In oxidized samples La1−xBixMnO3+λ a phase transition from a ferromagnetic state (rhombohedric phase) to a state of the spin glass type (quasitetrago...

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Veröffentlicht in:Low temperature physics (Woodbury, N.Y.) N.Y.), 2002-07, Vol.28 (7), p.569-573
Hauptverfasser: Troyanchuk, I. O., Mantytskaja, O. S., Szymczak, H., Shvedun, M. Yu
Format: Artikel
Sprache:eng
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Zusammenfassung:The crystal structure and magnetic properties of the La1−xBixMnO3+λ system (0⩽x⩽1;λ⩽0.08) are studied as functions of the oxygen and bismuth contents. In oxidized samples La1−xBixMnO3+λ a phase transition from a ferromagnetic state (rhombohedric phase) to a state of the spin glass type (quasitetragonal phase) is observed with increase of the bismuth concentration. The reduced samples La1−xBixMnO3 are weak ferromagnets down to x⩽0.6 and then transform into a ferromagnetic state. It is supposed that the Bi3+ ions stabilize the dx2−y2 orbitals in the nearest Mn3+ ions whereas the dz2 orbitals of the La3+ ions are stabilized. The orbitally disordered phases and dx2−y2-orbitally ordered phases are ferromagnetic, the dz2-orbitally ordered phases show antiferromagnetic ordering, and the state of the orbital glass type corresponds to a state of the spin glass type.
ISSN:1063-777X
1090-6517
DOI:10.1063/1.1496669