Pr0.5Sr0.5-xBaxMnO3: Size and Mismatch Effects on Structural and Magnetic Transitions
| Autor: | C. Autret, Maryvonne Hervieu, C. Martin, Z. Jirak, Antoine Maignan, F. Bouree, Bernard Raveau, Gilles André |
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| Rok vydání: | 2003 |
| Předmět: |
Materials science
Condensed matter physics General Chemical Engineering Neutron diffraction General Chemistry Microstructure Condensed Matter::Materials Science Molecular geometry Ferromagnetism Electron diffraction Lattice (order) Materials Chemistry Antiferromagnetism Condensed Matter::Strongly Correlated Electrons Phase diagram |
| Zdroj: | Chemistry of Materials. 15:1886-1896 |
| ISSN: | 1520-5002 0897-4756 |
| DOI: | 10.1021/cm020474s |
| Popis: | The structural and magnetic transitions in the Pr0.5Sr0.5-xBaxMnO3 series have been investigated by neutron diffraction and electron microscopy, in connection with the transport and magnetic properties, allowing a new phase diagram (T, x, or ) to be drawn. Two important points emerge from this study. First, a phase separation is observed for a large part of the diagram, described as a mixture of ferromagnetic, antiferromagnetic, and poorly ordered magnetic phases at low temperature for x > 0.2. Second, A-type antiferromagnetism (AFM) develops in nearly regular perovskite lattice. The case of Pr0.5Ba0.5MnO3 is also discussed because its microstructure is not conventional with local cationic ordering in the random A-site matrix. |
| Databáze: | OpenAIRE |
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