Phase transition of KDP observed by Resonant X-ray Diffraction at forbidden reflectionsстатья
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Аннотация:We report observations of space-group-forbidden Bragg reflections in KDP,
measured by resonant x-ray diffraction at the potassium Kedge.We find clear evidence
for a transition from one class of space-group-forbidden reflections,where scattering is ruled
out by the electric dipole approximation,to a second class,in the ferroelectric phase, where
scattering can proceed due to resonant anisotropy within the dipole approximation.The change
of symmetry is clearly evidenced by the sudden change of intensity and energy spectrum of the forbidden reflections.