Abstract
In this study, electron diffraction patterns observed under high vacuum conditions for an SrTiO3 surface were interpreted in detail while paying special attention to the features of inelastic effects. The surface of the SrTiO2 was carefully prepared to enforce its termination with single domains of TiO2 layers at the top. The inelastic patterns were interpreted using analytical models. Two types of Kikuchi lines are recognized in this paper: those which can be described with the Bragg law and those which appear due to surface wave resonance effects. However, we also discuss that there exists a formal connection between the two types of the Kikuchi lines observed.
Highlights
If a beam of electrons with energies of 10–50 keV hits a crystal surface, diffraction of the electron waves occurs, and diffraction patterns on respective screens can be observed.Some bands called Kikuchi effects may appear, which cannot be explained directly with the concept of plane wave diffraction; it is necessary to assume that some electrons are first incoherently scattered into all directions and only diffracted
Two types of Kikuchi lines are recognized in this paper: those which can be described with the Bragg law and those which appear due to surface wave resonance effects
reflection high-energy diffraction (RHEED), it is relatively rare to carry out the analysis of inelastic features caused by thermal vibrations because this type of regular effect can be observed in the grazing geometry only if the surface of a sample is very well ordered
Summary
If a beam of electrons with energies of 10–50 keV hits a crystal surface, diffraction of the electron waves occurs, and diffraction patterns on respective screens can be observed. RHEED, it is relatively rare to carry out the analysis of inelastic features caused by thermal vibrations because this type of regular effect can be observed in the grazing geometry only if the surface of a sample is very well ordered (otherwise, surface imperfections cause stronger but less regular effects) It seems that a deeper understanding of phonon scattering features is becoming more and more important even for RHEED because nowadays, nanostructured samples are much more refined than those fabricated 40 years ago, when the use of RHEED started to become popular (in combination with molecular beam epitaxy). According to the explanation given by Sun et al [12], the occurrence of double periods is caused by the difference in the mean inner potential for TiO2 - and SrO-terminated surfaces To support their description, the authors precisely analyzed the variations in the shapes of the Kikuchi lines. We investigated a TiO2 -terminated SrTiO3 crystal, which is an example of a well-prepared perovskite substrate
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