The uniaxially aperiodic structure of a thin Cu film on fivefold i-Al–Pd–Mn

A thin film of copper on the fivefold surface of Al-Pd-Mn forms a structure that is uniaxially commensurate with the aperiodic structure of the substrate. This structure has been analyzed using low-energy electron diffraction and is found to consist of a vicinal surface of a body-centered tetragonal...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2009-11, Vol.21 (47), p.474213-474213 (7)
Main Authors: Pussi, K, Gierer, M, Diehl, R D
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Physics
Structure and morphology
thickness
Surfaces and interfaces
thin films and whiskers (structure and nonelectronic properties)
Thin film structure and morphology
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Summary:A thin film of copper on the fivefold surface of Al-Pd-Mn forms a structure that is uniaxially commensurate with the aperiodic structure of the substrate. This structure has been analyzed using low-energy electron diffraction and is found to consist of a vicinal surface of a body-centered tetragonal (bct) (100) structure. This bct(100) structure has lattice parameters of a = 2.88 Å, b = 2.55 Å and c = 2.88 Å, with the vicinal surface making an angle α of 13.28° relative to the a-b plane. This structure provides an explanation for the delayed ordering observed during the growth of the film. Simple conditions are derived for which the growth of ordered one-dimensionally quasiperiodic thin films on quasicrystals may be favorable. This finding is relevant to the use of quasicrystals as a means of matching interfaces in thin film systems.
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/21/47/474213