Nucleation and growth of a quasicrystalline monolayer: Bi adsorption on the fivefold surface of i -Al70 Pd21 Mn9

Smerdon, Joe orcid iconORCID: 0000-0002-7387-8362, Parle, J.K., Wearing, L.H., Lograsso, T.A., Ross, A.R. and McGrath, R. (2008) Nucleation and growth of a quasicrystalline monolayer: Bi adsorption on the fivefold surface of i -Al70 Pd21 Mn9. Physical Review B - Condensed Matter and Materials Physics, 78 (7). ISSN 10980121

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Official URL: http://dx.doi.org/10.1103/PhysRevB.78.075407

Abstract

Scanning tunneling microscopy has been used to study the formation of a Bi monolayer deposited on the fivefold surface of i -Al70 Pd21 Mn9. Upon deposition of low submonolayer coverages, the nucleation of pentagonal clusters of Bi adatoms of edge length 4.9 is observed. The clusters have a common orientation leading to a film with fivefold symmetry. By inspection of images where both the underlying surface and the Bi atoms are resolved, the pentagonal clusters are proposed to nucleate on pseudo-Mackay clusters truncated such that a Mn atom lies centrally in the surface plane. The density of these sites is sufficient to form a quasiperiodic framework, and subsequent adsorption of Bi atoms ultimately leads to the formation of a quasicrystalline monolayer. The suggested nucleation site is different from that proposed on the basis of recent density-functional theory calculations.


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