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- W2019575530 abstract "The X-ray extinction conditions are studied for the cases when both magnetic interaction and crystalline fields cause the anisotropy of X-ray scattering amplitudes near the absorption edge. It is demonstrated that the simultaneous existence of those two anisotropies, referred to as the combined anisotropy, can result in excitation of additional Bragg reflections otherwise forbidden by extinction rules. To show this, the structure amplitudes of reflections are computed and two Laue (L) groups are compared: one, Lm, which corresponds to the anomalous X-ray scattering in the presence of magnetic structure and another one, Lq, which takes into account the anisotropic atomic environment. Both groups can contain additional reflections and differ from the Laue group, Lp, associated with the usual potential X-ray scattering. The cross of these groups is considered and it is shown that several extinctions, typical for the Lp group, still remain in Lq and Lm. Nevertheless, the new reflections may appear instead of those extinctions when the combined anisotropy is taken into account. In this case, the diffraction pattern is characterized by the Lc group. Then, the transformation of Lq into Lc under the phase transition is studied. It is shown that the additional reflections, not typical for Lm, can appear in the diffraction pattern below the magnetic ordering temperature TM. Two cases are discussed: (i) Lq above TM contains the same reflections as Lc and (ii) Lq contains the extinctions corresponding to the additional reflections in Lc. Several examples are considered for real magnetic crystals." @default.
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- W2019575530 date "1997-05-01" @default.
- W2019575530 modified "2023-09-27" @default.
- W2019575530 title "Combined Effects of Magnetic Structure and Local Crystal Fields in Anisotropic X-ray Anomalous Scattering" @default.
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- W2019575530 doi "https://doi.org/10.1107/s0108767397002377" @default.
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