Münster 1997 – wissenschaftliches Programm
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O: Oberflächenphysik
O 36: Phasenübergänge und dynamische Eigenschaften
O 36.9: Vortrag
Donnerstag, 20. März 1997, 18:00–18:15, BOT
Anomalous Strong Repulsive Step-Step Interaction on Slightly Misoriented Si(113) — •S. van Dijken, H.J.W. Zandvliet, and Bene Poelsema — Faculty of Applied Physics and Centre of Materials Research, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
We have used scanning tunneling microscopy to study Si(113) 0.2o misoriented towards [110]. Rapid quenching of this surface from 1500-1575 K to room temperature results in an uniformly stepped single domain surface, whereas slower cooling gives rise to clustering of steps. The thermally induced step wandering and the terrace width distribution of the uniformly stepped surface are analyzed in order to determine the strength of the energetic and entropic step-step interactions. Besides the short-range attractive step-step interaction found on Si(113) misoriented 1o−5o towards [001] [1], we found an anomalous strong long-range repulsive step-step interaction on Si(113) 0.2o misoriented towards [110]. The coexistence of a long-range repulsive and a short-range attractive step-step interaction may explain the transition from an uniformly stepped surface at high freeze in temperature to a faceted surface at lower freeze in temperatures.
[1] S. Song and S. G. J. Mochrie, Phys. Rev. Lett. 73, 995 (1994)