期刊
PHYSICAL REVIEW B
卷 78, 期 13, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.78.134110
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资金
- EPSRC [EP/F000375/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/F000375/1] Funding Source: researchfish
We propose a model for the Fe atomic displacements in the low-temperature phase of magnetite (Fe3O4), based on the analysis of the photon energy dependence of the scattered intensity of selected reflections in a resonant x-ray scattering experiment. The symmetry of the displacement pattern is forced to be consistent with the Cc space group, long time claimed to be the actual symmetry of the low-temperature phase. Fe positions at octahedral sites and the corresponding charges are accounted for by a fitting procedure comparing simulations and experiment. We found a pattern of small distortions in the a-b plane. An independent sensitivity to the charge occupancy permits to refine the model of charge ordering previously proposed. Finally we have computed the electric moment of the combined charge displacements to be 1.5 mu C/cm(2).
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