Study of structure and lattice dynamics of the Sr2CuO2Cl2(001) surface by helium-atom scattering
M. Farzaneh, XF. Liu, M. El-Batanouny, F. C. Chou
Abstract
Structure and lattice dynamics of the (001) surface of Sr2CuO2Cl2 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-1. Comparison between the experimental data and theoretical results for two different slabs with SrCl and CuO2 terminations showed that the experimental data conforms exclusively with the SrCl surface modes.
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