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29 March 2024
 
  » arxiv » 1003.3834

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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
AbstractStrain 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
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