Surface stress of Ni adlayers on W(110): the critical role of the surface atomic structure

Details Surface stress of Ni adlayers on W(110): the critical role of the surface atomic structure Surface stress of Ni adlayers on W(110): the critical role of the surface atomic structure

2012-03-15

arxiv.org/abs/1203.3337v1

Physics

Condensed Matter

Materials Science

14 pages, 3 figures Published in J. Phys.: Condens. Matter 24 (2012) 135001

Scientific paper

Puzzling trends in surface stress were reported experimentally for Ni/W(110) as a function of Ni coverage. In order to explain this behavior, we have performed a density-functional-theory study of the surface stress and atomic structure of the pseudomorphic and of several different possible 1x7 configurations for this system. For the 1x7 phase, we predict a different, more regular atomic structure than previously proposed based on surface x-ray diffraction. At the same time, we reproduce the unexpected experimental change of surface stress between the pseudomorphic and 1x7 configuration along the crystallographic surface direction which does not undergo density changes. We show that the observed behavior in the surface stress is dominated by the effect of a change in Ni adsorption/coordination sites on the W(110) surface.

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