Study of structure and lattice dynamics of the SrCuOCl(001) surface by helium-atom scattering
arXiv:cond-mat/0503680 · doi:10.1103/PhysRevB.72.085409
Abstract
Structure and lattice dynamics of the (001) surface of SrCuOCl have been studied by helium atom scattering (HAS). Analysis of diffraction patterns obtained by elastic HAS revealed a surface periodicity consistent with bulk termination, and confirms that the surface is non-polar and stable which favors a SrCl surface termination. Bulk and surface lattice dynamical calculations based on the shell-model were carried out to characterize the experimental phonon dispersions obtained by inelastic HAS. No experimental surface mode was observed above 200 cm. Comparison between the experimental data and theoretical results for two different slabs with SrCl and CuO terminations showed that the experimental data conforms exclusively with the SrCl surface modes.
arXiv comment10 pages, 11 figures
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- Implications of second harmonic generation for hidden order in SrCuOCl
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