%0 Journal Article
%J Physical Review B
%D 2009
%T Nucleation of Pb starfish clusters on the five-fold Al-Pd-Mn quasicrystal surface
%A Ledieu, J.
%A Krajci, M.
%A Hafner, J.
%A Leung, L.
%A Wearing, L. H.
%A McGrath, R.
%A Lograsso, T. A.
%A Wu, D.
%A Fournee, V.
%K ab initio calculations
%K adsorption
%K alpdmn icosahedral phase
%K augmented-wave method
%K density functional theory
%K electronic-structure
%K lead
%K metal clusters
%K nucleation
%K quasicrystals
%K scanning tunnelling microscopy
%K total energy
%K total-energy calculations
%M ISI:000265945200108
%P 165430
%R 10.1103/Physrevb.79.165430
%U ://000265945200108
%V 79
%X 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.
%Z 443XXTimes Cited:0Cited References Count:39
%8 04/01
%@ 1098-0121