Aperiodic and modulated Pb thin films on fivefold icosahedral Al-Cu-Fe and Al(111): Tailoring the structure of Pb
Résumé
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 mono-layer. On the Al111 substrate, the mobility of Pb adatoms is high and the interaction with the substrate is flatter, leading to the formation of a 31 31R8.95° higher-order commensurate structure. This moiré structure propagates up to the highest coverages investigated.
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