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Temperature dependence of surface stress across an order-disorder transition: p(1x2)O/W(110) | N. Stojic
; T. O. Mentes
; N. Binggeli
; M. A. Nino
; A. Locatelli
; E. Bauer
; | Date: |
19 Mar 2010 | Abstract: | Strain relaxations of a p(1x2) ordered oxygen layer on W(110) are measured as
a function of temperature across the disordering transition using low-energy
electron diffraction. The measured strains approach values of 0.027 in the
[1-10] and -0.053 in the [001] direction. On the basis of the measured strain
relaxations, we give quantitative information on temperature-dependent surface
stress using the results of ab initio calculations. From the surface formation
energy for different strains, determined by first-principles calculations, we
estimate that surface stress changes from -1.1 for the ordered phase to -0.2N/m
for the disordered one along [1-10], and from 5.1 to 3.4 N/m along [001].
Moreover, our observation that the strains scale inversely with domain size
confirms that the strain relaxation takes place at the domain boundaries. | Source: | arXiv, 1003.3834 | Services: | Forum | Review | PDF | Favorites |
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