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Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2009

Nucleation of Pb starfish clusters on the five-fold Al-Pd-Mn quasicrystal surface

Résumé

The nucleation of Pb clusters on the five-fold Al-Pd-Mn quasicrystal surface has been investigated using scanning tunneling microscopy STM and ab initio calculations based on density-functional theory DFT. In the submonolayer regime, Pb atoms are highly mobile and adsorb preferentially within equatorially truncated pseudo-Mackay clusters present at the surface. The decoration of these unique adsorption sites leads to the formation of five-fold islands dubbed " starfish " and eventually to a quasiperiodic Pb monolayer. From a comparison of measured and calculated STM images it is concluded that most starfish clusters on all terraces are composed of ten Pb adatoms. A model of the structure of the starfish cluster has been proposed. Our total-energy calculations confirm its stability. The experimentally measured height profile of the starfish cluster is also reproduced by the DFT calculations.
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hal-01665126 , version 1 (15-12-2017)

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Julian Ledieu, M. Krajčí, J. Hafner, L. Leung, L. H. Wearing, et al.. Nucleation of Pb starfish clusters on the five-fold Al-Pd-Mn quasicrystal surface. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2009, 79 (16), pp.165430. ⟨10.1103/PhysRevB.79.165430⟩. ⟨hal-01665126⟩
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