Temperature dependence of surface stress across an order-disorder transition: p(1x2)O/W(110)

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.

8 pages, 5 figures

References in corpus (4)

• Quantum ESPRESSO: a modular and open-source software project for quantum simulations of materials
• In situ observation of stress relaxation in epitaxial graphene
• Stress induced stripe formation in Pd/W(110)
• Strain relaxation in small adsorbate islands: O on W(110)

Cited by in corpus (4)

• Surface stress of Ni adlayers on W(110): the critical role of the surface atomic structure
• High-temperature oxygen monolayer structures on W(110) revisited
• Stress engineering at the nanometer scale: Two-component adlayer stripes
• Self-organization in Pd/W(110): interplay between surface structure and stress