Structural and electronic characterisation of Cu/Au(111) near-surface alloys
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Geometrical structure and electronic characteristics of ultrathin metallic films of one metal on another are strongly influenced by factors such as lattice mismatch and formation of near-surface alloys. Doped systems often show modified chemical-physical properties which may be amenable to different reactivity routes. Copper-gold surface alloys have received the attention of several studies, only a few of which have been undertaken in an UHV environment, using surface sensitive techniques. In this contribution, systems produced upon room temperature deposition of copper on the (22×√3)-Au(111) surface, at various copper loadings and annealed to different temperatures, are investigated using scanning tunnelling microscopy and synchrotron radiation based techniques (X-ray photoelectron diffraction, photoemission), with comparison with some theoretical modelling. Overall the fcc lattice is essentially maintained on preparation. Upon thermal treatments structural and compositional changes, in favour of alloyed structures with tetragonal packing, are seen.
Grillo , F , Megginson , R , Batchelor , D , Muntwiler , M & Baddeley , C J 2019 , ' Structural and electronic characterisation of Cu/Au(111) near-surface alloys ' , Japanese Journal of Applied Physics , vol. 58 , no. SI , SIIB09 . https://doi.org/10.7567/1347-4065/ab1b5b
Japanese Journal of Applied Physics
Copyright © 2019 The Japan Society of Applied Physics. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.7567/1347-4065/ab1b5b
DescriptionThe Engineering and Physical Sciences Research Council (EPSRC) is acknowledged for the funding of FG (EP/M029077/1) and RM (EP/506631/1). The Paul Scherrer Institut, Villigen, Switzerland is acknowledged for provision of synchrotron radiation beamtime at the PEARL beamline of the SLS. Nicolas Bachellier, Daria Sostina and Patrick Ascher are thanked for assistance. DB thanks the Helmholtz Association Program MML for financial funding in this work.
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