Growth and decay of hcp-like Cu hut-shaped structures on W(100)

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Abstract

We have studied both the morphology and structure of thin Cu deposits on W(100) during growth and desorption, using low-energy electron microscopy (LEEM) and selective area low-energy electron diffraction (μLEED). During growth at 674 K hut-shaped Cu crystallites with steep facets (> 54∘) coexist with a pseudomorphic Cu monolayer. The μLEED data suggest that these crystallites predominantly have a hcp structure with a high density of stacking faults and the (112̅ 0) plane parallel to W(100). The boundaries run along the [1̅ 50] azimuth on W(100), which is explained by cancellation of shear stress exerted by Cu on the W(100) surface. Upon slow heating, Cu desorbs and the pseudomorphic wetting layer is transformed into coexisting surface alloy patches, with respectively, a Cu-rich p(2×2) and p(2×1) structure at 815 K. At about 950 K the islands are fully desorbed, leaving p(2×1) footprints behind. The p(2×2) patches disappear at about 1020 K, resulting in a homogeneous p(2×1) surface. Upon continued Cu desorption this surface transforms into small c(2×2) domains until all Cu has been desorbed at 1150 K
Original languageEnglish
Article number125417
Pages (from-to)-
Number of pages8
JournalPhysical review B: Condensed matter and materials physics
Volume85
Issue number12
DOIs
Publication statusPublished - 2012

Keywords

  • METIS-286058
  • IR-84671

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