Abstract
The spatial distribution of quasi-elastically back-scattered electrons from single-crystalline YBa 2Cu 3O x (001), a high- T c superconductor ( T c = 91 K), has been measured at 2 keV energy with high angular resolution (1°). The data are presented as a full-hemispherical intensity map. It is characterized by a fourfold symmetry and resembles the Kikuchi pattern of a bcc crystal. These data are compared with single-scattering cluster simulations performed with structural models for the near-surface layers identical to those in the bulk and for different types of the crystal termination. Rather good agreement is found when the cluster is sufficiently large (more then 700 atoms) indicating that at room temperature the investigated near-surface layers have a local structure similar to the bulk one.
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