Journal Article

PreJuSER-57670

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Growth and electronic structure of alkali-metal adlayers on icosahedral Al70.5Pd21Mn8.5

Shukla, A. K. ; Dahka, R. S. ; Biswas, C. ; Banik, S. ; Barman, S. R. ; Horn, K.FZJ* ; Ebert, P.FZJ* ; Urban, K.FZJ*

2006
APS College Park, Md.

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Please use a persistent id in citations: http://hdl.handle.net/2128/7710  doi:10.1103/PhysRevB.73.054432

Abstract: We report x-ray photoelectron spectroscopy (XPS) study of Na and K adlayers on icosahedral Al70.5Pd21Mn8.5 (i-Al-Pd-Mn) quasicrystal. The Na 1s core-level exhibits a continuous linear shift of 0.8 eV towards lower binding energies (BE) with increasing coverage up to one monolayer (ML) saturation coverage. In the case of K/i-Al-Pd-Mn, a similar linear shift in the K 2p spectra towards lower BE is observed. In both cases, the plasmon related loss features are observed only above 1 ML. The substrate core-level peaks, such as Al 2p, do not exhibit any shift with the adlayer deposition up to the highest coverage. Based on these experimental observations and previous studies of alkali metal growth on metals, we conclude that below 1 ML, both Na and K form a dispersed phase on i-Al-Pd-Mn and there is hardly any charge transfer to the substrate. The variation of the adlayer and substrate core-level intensities with coverage indicates layer by layer growth.

Keyword(s): J

Note: Record converted from VDB: 12.11.2012

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Contributing Institute(s):

1. Mikrostrukturforschung (IFF-IMF)
2. Jülich-Aachen Research Alliance - Fundamentals of Future Information Technology (JARA-FIT)

Research Program(s):

1. Kondensierte Materie (P54)
2. Grundlagen für zukünftige Informationstechnologien (P42)

Appears in the scientific report 2006
Notes: Nachtrag

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