Pr0.5Ca0.5Mn0.97Ga0.03O3, a strongly strained system due to the coexistence of two orbital ordered phases at low temperature |
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Authors: | C. Yaicle F. Fauth R. Retoux M. Hervieu A. Maignan |
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Affiliation: | a Laboratoire CRISMAT, UMR 6508CNRS ENSICAEN, 6 bd Maréchal Juin, 14050 CAEN Cedex, France b ESRF, BP 220, 6 Rue Jules Horowitz, F-38043 Grenoble, France c Institute of Physics ACSR, Cukrovarnicka 10, 162 53 Prague 6, Czech Republic |
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Abstract: | Combining low-temperature electron (ED) and synchrotron powder diffraction (SPD) techniques, we have precisely determined the phase-separated crystal structure of Pr0.5Ca0.5Mn0.97Ga0.03O3. 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. |
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Keywords: | 75.50.&minus y 61.10.Nz 61.16.&minus d 81.30.&minus t |
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