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|Type:||Artigo de periódico|
|Title:||Growth Study Of Cu/pd(1 1 1) By Rheed And Xps|
|Author:||De Siervo A.|
|Abstract:||An X-ray photoelectron spectroscopy (XPS) and reflection high-energy electron diffraction (RHEED) investigation of the growth of Cu films on a Pd(1 1 1) single crystal at room temperature is presented. Dynamically taken XPS-data as function of the deposition time show a linear variation of I Cu-3p/IPd-3d and a periodic change of its slope indicating a nearly layer-by-layer growth process. RHEED oscillations are seen for the 3-4 first layers, also suggesting a smooth growth mode. From the evolution of the RHEED-streaks separation the in-plane Cu-atom spacing is precisely determined. Up to a coverage of ca. 2-3 monolayers (ML) Cu grows pseudomorphously on Pd(1 1 1), despite the -7.1% strain imposed by the substrate lattice parameter. Non-pseudomorphous epitaxial growth is evidenced above ca. 3-4 ML by a discontinuous change in lateral lattice spacing observed by RHEED which indicates a relaxation to the Cu(1 1 1) "natural" surface lattice parameter. In addition it is concluded that surface alloying does not take place at least at room temperature (RT)-XPS spectra taken dynamically during annealing show that alloying occurs only above RT. © 2004 Elsevier B.V. All rights reserved.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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