Strain relaxation in small adsorbate islands: O on W(110)

Details Strain relaxation in small adsorbate islands: O on W(110) Strain relaxation in small adsorbate islands: O on W(110)

2008-04-24

arxiv.org/abs/0804.3953v1

Phys. Rev. B 77, 155414 (2008)

Physics

Condensed Matter

Materials Science

22 pages, 5 figures

Scientific paper

10.1103/PhysRevB.77.155414

The stress-induced lattice changes in a p(1x2) ordered oxygen layer on W(110) are measured by low-energy electron diffraction. We have observed that small oxygen islands show a mismatch with the underlying lattice. Our results indicate that along [1-10] the average mismatch scales inversely with the island size as 1/L for all oxygen coverages up to 0.5 ML, while along [001] it is significant only for the smallest oxygen islands and scales as a higher power of the inverse island size. The behaviour along [1-10] is described by a one-dimensional finite-size Frenkel-Kontorova model. Using this model, together with calculated force constants, we make a quantitative estimate for the change of surface-stress upon oxygen adsorption. The result is consistent with our ab-initio calculations, which give a relative compressive stress of -4.72 N/m along [1-10] and a minute relative tensile stress of 0.15 N/m along [001]. The scaling along [001] is qualitatively explained as an effect induced by the lattice relaxation in the [1-10] direction.

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