Pr0.5Ca0.5Mn0.97Ga0.03O3, a strongly strained system due to the coexistence of two orbital ordered phases at low temperature
| Autor: | Maryvonne Hervieu, Richard Retoux, Antoine Maignan, François Fauth, Z. Jirák, C. Martin, C. Yaicle, B. Raveau |
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| Rok vydání: | 2005 |
| Předmět: |
Materials science
Colossal magnetoresistance Condensed matter physics Order (ring theory) Crystal structure Electron Condensed Matter Physics Manganite Electronic Optical and Magnetic Materials Inorganic Chemistry Charge ordering Electron diffraction Materials Chemistry Ceramics and Composites Physical and Theoretical Chemistry Perovskite (structure) |
| Zdroj: | Journal of Solid State Chemistry. 178:1652-1660 |
| ISSN: | 0022-4596 |
| DOI: | 10.1016/j.jssc.2005.02.028 |
| Popis: | Combining low-temperature electron (ED) and synchrotron powder diffraction (SPD) techniques, we have precisely determined the phase-separated crystal structure of Pr{sub 0.5}Ca{sub 0.5}Mn{sub 0.97}Ga{sub 0.03}O{sub 3}. We demonstrate that the phase separation is associated with the onset of charge/orbital ordering at {approx}230K and that two ordered phases coexist at low temperature. In order to account for the significant anisotropic linewidth broadening observed in the SPD patterns, we had to include a specific strain model in the refinements. One of the phases, the most severely strained, is suggested to result from an imperfect charge ordering. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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