Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2005-03-29
Physics
Condensed Matter
Other Condensed Matter
10 pages, 11 figures
Scientific paper
10.1103/PhysRevB.72.085409
Structure and lattice dynamics of the (001) surface of Sr$_2$CuO$_2$Cl$_2$ 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 CuO$_2$ terminations showed that the experimental data conforms exclusively with the SrCl surface modes.
Chou Fang-Chieh
El-Batanouny Michael
Farzaneh M.
Liu Xiandong
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