Pr0.5Ca0.5Mn0.97Ga0.03O3, a strongly strained system due to the coexistence of two orbital ordered phases at low temperature
✍ Scribed by C. Yaicle; F. Fauth; C. Martin; R. Retoux; Z. Jirak; M. Hervieu; B. Raveau; A. Maignan
- Publisher
- Elsevier Science
- Year
- 2005
- Tongue
- English
- Weight
- 888 KB
- Volume
- 178
- Category
- Article
- ISSN
- 0022-4596
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✦ Synopsis
Combining low-temperature electron (ED) and synchrotron powder diffraction (SPD) techniques, we have precisely determined the phase-separated crystal structure of Pr 0.5 Ca 0.5 Mn 0.97 Ga 0.03 O 3 . We demonstrate that the phase separation is associated with the onset of charge/orbital ordering at $230 K 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.