Formation of a quasicrystalline Pb monolayer on the 10-fold surface of the decagonal Al-Ni-Co quasicrystal

SURFACE SCIENCE

卷:602

Article

Smerdon, J. A.^1,2  Leung, L.^1,2  Parle, J. K.^1,2  Jenks, C. J.³  McGrath, R.^1,2  Fournee, V.⁴  Ledieu, J.⁴ 

[1] Univ Liverpool, Dept Phys, Liverpool L69 3BX, Merseyside, England

[2] Univ Liverpool, Surface Sci Res Ctr, Liverpool L69 3BX, Merseyside, England

[3] Iowa State Univ, Ames Lab, Ames, IA 50011 USA

[4] Ecole Mines, LSGM2, CNRS, UMR 7584, F-54042 Nancy, France

关键词: STM;    LEED;    epitaxy;    quasicrystal;    lead;   

DOI  :  10.1016/j.susc.2008.05.029

来源: Elsevier

【 摘 要 】

Lead has been deposited on the 10-fold surface of decagonal Al72Ni11Co17 at room temperature to form an epitaxial quasicrystalline single-element monolayer. The overlayer grows through nucleation of nanometer-sized irregular-shaped islands and the coverage saturates at 1 MLE. The overlayer is well-ordered quasiperiodically as evidenced by LEED and Fourier transforms of STM images. LEED measurements also indicate that annealing the film to 600 K improves the structural quality, but STM shows that this causes the film to develop pores. Adsorption of C-60 molecules on this surface showed that the pores are Pb-containing. Electronic structure measurements using X-ray photoemission spectroscopy indicate that the chemical interaction of the Pb atoms with the substrate is weak, and that Pb does not desorb from the surface upon annealing. (C) 2008 Elsevier B.V. All rights reserved.

【 授权许可】

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