Fig. 6
From: Picometer polar atomic displacements in strontium titanate determined by resonant X-ray diffraction
The 007 reflection profiles of SrTiO3 before and after formation of the MFP phase. The maximum on the right hand side corresponds to cubic (bulk) SrTiO3 and is the only feature under normal conditions (crosses). After formation (circles), a shoulder peak is observed at lower momentum transfer Q z , which is associated with the MFP phase. The intensity ratio of both peaks is very different when measured at two different energies near the Sr-K edge –15,962 eV (black) and 16,150 eV (red, shifted to top). This can be explained by a change of the relative, crystallographic positions of the atoms. These atomic displacements were obtained from fitting the energy dependencies (see Fig. 7). The unit cells in the top of the figure (green: strontium, blue: titanium and red: oxygen) show the displacements enhanced by a factor of 10 for better visibility. Arrows mark values for which fixed Q energy scans have been recorded
