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

2009; IOP Publishing; Volume: 21; Issue: 47 Linguagem: Inglês

10.1088/0953-8984/21/47/474213

1361-648X

K. Pussi, M. Gierer, Renee D. Diehl,

X-ray Diffraction in Crystallography

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.