Structure and lattice dynamics of Sr2CuO2Cl2(001) studied by helium-atom scattering
Journal
Physical Review B - Condensed Matter and Materials Physics
Journal Volume
72
Journal Issue
8
Date Issued
2005
Author(s)
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 nonpolar 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 200cm-1. Comparison between the experimental data and theoretical results for two different slabs with SrCl and CuO2 terminations showed that the experimental data conform exclusively with the SrCl surface modes. © 2005 The American Physical Society.
Type
journal article