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Challenging our understanding of epitaxy on clean and O-precovered Pt(111), the ab initio Schwoebel barrier calculated for downward self-diffusion across A-type steps on Pt(111) is only ES(A)≈0.02eV. Geometric arguments explain why ES(B), the Schwoebel barrier at B-type steps, is more than an order of magnitude larger than ES(A).
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Peter J. Feibelman (1998) studied this question.
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