Nucleation and growth of a quasicrystalline monolayer: Bi adsorption on the fivefold surface of i-Al70Pd21Mn9

TitleNucleation and growth of a quasicrystalline monolayer: Bi adsorption on the fivefold surface of i-Al70Pd21Mn9
Publication TypeJournal Article
Year of Publication2008
AuthorsSmerdon JA, Parle JK, Wearing LH, Lograsso TA, Ross AR, McGrath R
Journal TitlePhysical Review B
Volume78
Pages075407
Date PublishedAug
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberISI:000259406700088
Keywordsal70pd21mn9
Abstract

Scanning tunneling microscopy has been used to study the formation of a Bi monolayer deposited on the fivefold surface of i-Al70Pd21Mn9. Upon deposition of low submonolayer coverages, the nucleation of pentagonal clusters of Bi adatoms of edge length 4.9 angstrom 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.

DOI10.1103/PhysRevB.78.075407
Alternate JournalPhys. Rev. B