Regensburg 2004 – wissenschaftliches Programm

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O: Oberflächenphysik

O 14: Postersitzung (Adsorption an Oberflächen, Epitaxie und Wachstum, Organische Dünnschichten, Oxide und Isolatoren, Phasenübergänge, Rastersondentechniken, Struktur und Dynamik reiner Oberflächen)

O 14.49: Poster

Montag, 8. März 2004, 18:00–21:00, Bereich C

Scanning Probe Microscopy of Antimony Single Crystals: Periodic and Non-periodic Features of the (0001) Cleavage Surface — •B. Stegemann1,2, C. Ritter1, B. Kaiser1, and K. Rademann11Institut für Chemie, Humboldt-Universität zu Berlin — 2Institut für Experimentalphysik, Freie Universität Berlin

Morphology, atomic structure and irregular features of the Sb(0001) cleavage plane of antimony single crystals are investigated in detail by STM and AFM. Atomically resolved STM images of the hexagonal structure of surface atoms on Sb(0001) are presented, extending the base of STM data available on elemental surfaces. Lateral and vertical lattice parameters are determined. As the observed lattice spacing of 4.31 Å on Sb(0001) agrees well with the known bulk data, surface reconstruction can be excluded. Cleavage is found to occur always between adjacent double layers yielding at least diatomic cleavage steps of 3.75 Å height. Crystal imperfections such as vacancies (0D defects) and step edges (1D defects) are elucidated and imaged with atomic resolution. Moreover, twinned interlayers (2D defects) formed upon cleavage of Sb at room temperature are revealed, confirming the twinning angle of 2.45 degrees, which has been predicted by the model of twinning in Sb crystals. Results are discussed in comparison with other layered materials and with regard to their relevance for the use of Sb(0001) as support for nanostructures.

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