Aperiodic and modulated Pb thin films on fivefold icosahedral Al-Cu-Fe and Al(111): Tailoring the structure of Pb

TitleAperiodic and modulated Pb thin films on fivefold icosahedral Al-Cu-Fe and Al(111): Tailoring the structure of Pb
Publication TypeJournal Article
Year of Publication2009
AuthorsDeniozou T, Ledieu J, Fournee V, Wu DM, Lograsso TA, Li HI, Diehl RD
Journal TitlePhysical Review B
Volume79
Pages245405
Date Published06/01
ISBN Number1098-0121
Accession NumberISI:000267699700112
Keywordsadsorption, deposition, epitaxial-growth, lead, metal-surfaces, metallic thin films, monolayers, nucleation, quasi-crystal surfaces, quasicrystals, simulation, sticking probability, stm, surface diffusion
Abstract

We report on the growth of Pb thin films deposited either on the Al-rich fivefold surface of the icosahedral Al-Cu-Fe quasicrystal or on the (111) surface of fcc Al. On the quasicrystalline substrate, the diffusion length of Pb adatoms is short due to heterogeneous nucleation that enforces a quasiperiodic structure in the monolayer. On the Al(111) substrate, the mobility of Pb adatoms is high and the interaction with the substrate is flatter, leading to the formation of a (root 31x root 31)R8.95 degrees higher-order commensurate structure. This moireacute structure propagates up to the highest coverages investigated.

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URL<Go to ISI>://000267699700112
DOI10.1103/Physrevb.79.245405