Incommensurate structures and epitaxial growth of Li on Ru(0001): A quantitative low-energy electron-diffraction study
- 15 July 1995
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 52 (4), 2927-2934
- https://doi.org/10.1103/physrevb.52.2927
Abstract
The structural properties of Li films on a Ru(0001) surface during initial growth were determined employing the technique of low-energy electron diffraction (LEED). For submonolayer coverages between =0.61 and =0.78, incommensurate structures oriented along high-symmetry directions of the substrate were observed. Fully dynamical LEED calculations of a (5×5) structure modeling the Li overlayer at =0.64 revealed a Li-Ru interlayer spacing of 2.17±0.10 Å. The computational effort for solving this structure could be significantly reduced by using a (5×1) unit mesh instead of the (5×5) unit cell without losing structural information. The first Li layer is completed at a coverage of 0.78. In the multilayer regime, the Ru(0001)-Li system exhibits also long-range order as indicated by adsorbate-induced hexagonal LEED patterns. LEED structure analyses of Li films with thicknesses of two and three layers revealed that the Li film is grown fcc(111)-like on Ru(0001). The interlayer spacings are =2.35±0.10 Å and =2.35±0.10 Å; the Li hard-sphere radius turns out to be 1.52±0.05 Å, close to the metallic Pauling radius.
Keywords
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