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Communication Dans Un Congrès Année : 2021

Coherent diffraction imaging at space-group forbidden reflections

Résumé

On one hand, coherent diffraction imaging (CDI) in Bragg geometry has emerged as a unique 3D microscopy of nanocrystals thanks to 3rd generation synchrotron sources. Away from absorption edges and at space-group allowed reflections, it provides not only the electronic density, but also, encoded in the phase, the atomic displacement field with respect to the mean lattice, which in turn reveals crystal strain, defects and domains [1–3]. On the other hand, some crystal structures have crystallographic reflections which are forbidden by the space-group symmetry but can nevertheless be observed at a suitable X-ray absorption edge, due to the anisotropy of the tensor of scattering (ATS) [4]. They are several orders of magnitude weaker than allowed reflections, but the absence of Thomson scattering allows the observation of various electronic phenomena related to electronic orders (magnetic, charge, orbital), static and dynamic atomic displacements.
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Dates et versions

hal-03800006 , version 1 (07-10-2022)

Identifiants

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Guillaume Beutier, Joel Eymery, Maxime Dupraz, Marie-Ingrid Richard, Alexis Wartelle, et al.. Coherent diffraction imaging at space-group forbidden reflections. IUCr 2021 - 25th congress of the International Union of Crystallography, Aug 2021, Prague, Czech Republic. pp.C285-C285, ⟨10.1107/S0108767321093971⟩. ⟨hal-03800006⟩
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