Abstract
High energy x-ray diffuse scattering measurements were performed on single crystals of , to map out the diffuse scattering distribution in all three dimensions around a large number of Bragg peaks simultaneously. For , and 8%, the results are very similar, indicating same type of correlations of polarizations in these compounds. Our results show that the diffuse scattering intensity consists of six ⟨110⟩ rod-type intensities around reciprocal lattice points. A simple model is suggested where {110} type planar correlations of the in-plane type polarizations in real space contribute to the ⟨110⟩ rod-type diffuse intensities in the reciprocal space. The planar correlations of polarizations are likely a result from condensations of soft polarized optic phonon modes.
3 More- Received 4 May 2004
DOI:https://doi.org/10.1103/PhysRevB.70.174109
©2004 American Physical Society