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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 diffractionpatterns obtained by elastic HAS revealed a surface periodicity consistent withbulk termination, and confirms that the surface is non-polar and stable whichfavors a SrCl surface termination. Bulk and surface lattice dynamicalcalculations based on the shell-model were carried out to characterize theexperimental phonon dispersions obtained by inelastic HAS. No experimentalsurface mode was observed above 200 cm$^{-1}$. Comparison between theexperimental data and theoretical results for two different slabs with SrCl andCuO$_2$ terminations showed that the experimental data conforms exclusivelywith the SrCl surface modes.Comment: 10 pages, 11 figure

physical review. b, condensed matter and materials physics

Structure and lattice dynamics of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">Sr</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mi mathvariant="normal">Cu</mml:mi><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Cl</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:mn>001</mml:mn><mml:mo>)</mml:mo></mml:mrow></mml:mrow></mml:math>studied…

Structure and lattice dynamics ofSr2CuO2Cl2(001)studied…