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Article Dans Une Revue Physical Review B Année : 2001

Morphological instability of Cu vicinal surfaces during step-flow growth

Résumé

The step-flow growth of Cu on vicinal Cu surfaces, Cu (1 1 17) and Cu (0 2 24), is investigated by variable-temperature scanning-tunneling microscopy. These vicinal surfaces have identical terrace widths but their step orientation differs by 45°. Upon growth, the surfaces develop a step-meandering instability, resulting in an in-plane patterning of the surfaces with a temperature- and flux-dependent characteristic wavelength lbd_u . The instability-induced structural patterns depend on the step orientation and are the manifestation of the Bales-Zangwill instability in both cases. The selected characteristic wavelength is interpreted as the interplay of a destabilizing effect due to the presence of the Ehrlich-Schwöbel barrier and a stabilizing mechanism presumably due to ‘‘diffusion noise.’’ As a result, lbd_u is proportional to the one-dimensional nucleation length lbd_n along a straight step, involving the diffusion barrier along both the <110> and <100> step orientations on Cu(001)
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hal-04329671 , version 1 (07-12-2023)

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T. Maroutian, L. Douillard, H.-J. Ernst. Morphological instability of Cu vicinal surfaces during step-flow growth. Physical Review B, 2001, 64 (16), pp.165401. ⟨10.1103/PhysRevB.64.165401⟩. ⟨hal-04329671⟩
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