Phys. Rev. B 79, 245405 (2009) [9 pages]Aperiodic and modulated Pb thin films on fivefold icosahedral Al-Cu-Fe and Al(111): Tailoring the structure of PbReceived 16 February 2009; published 5 June 2009 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 (√31×√31)R8.95° higher-order commensurate structure. This moiré structure propagates up to the highest coverages investigated. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.79.245405
DOI:
10.1103/PhysRevB.79.245405
PACS:
68.37.Ef, 68.35.Rh, 71.23.Ft, 71.15.Mb
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