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Temperature-dependent change of the fractal dimension of Cu dendrites on Cu(111)
Authors
K. Morgenstern
C. Sprodowski
Publication date
1 January 2020
Publisher
Bristol : Institute of Physics Publishing
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Abstract
We investigate the shape of monatomic high Cu islands on a Cu(111) surface by variable-temperature scanning tunneling microscopy between 110 K and 240 K. Low temperature dendrites evolve towards more compact shapes at increasing temperature; finally reaching the equilibrium shape of a hexagon with rounded corners. Time-lapsed imaging at increasing temperature reveals the onset of shape change to be at ≈170 K, corresponding to the onset of edge and corner diffusion of atoms along the island's borders. Despite a substantial variation for individual islands at each temperature, the mean fractal dimension increases monotonously between 170 K up to 240 K, from the smallest to the largest values feasible for islands grown on surfaces. © 2020 The Author(s). Published by IOP Publishing Ltd on behalf of the Institute of Physics and Deutsche Physikalische Gesellschaft
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Institutionelles Repositorium der Leibniz Universität Hannover
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Last time updated on 11/04/2021