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Tensor LEED analysis of the Ni(111)(root 3x root 3)R30 degrees-Pb surface
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UNSPECIFIED (2002) Tensor LEED analysis of the Ni(111)(root 3x root 3)R30 degrees-Pb surface. PHYSICAL REVIEW B, 65 (23). -. doi:10.1103/PhysRevB.65.233404 ISSN 1098-0121.
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Official URL: http://dx.doi.org/10.1103/PhysRevB.65.233404
Abstract
The structure of the Ni(111)(root3xroot3)R30degrees-Pb surface has been determined by quantitative low-energy electron diffraction (LEED), using multiple-scattering simulations of the measured diffracted beam intensities with a tensor-LEED program. The results confirm that the surface comprises a single-layer substitutional alloy of stoichiometry Ni2Pb (with all atoms in "fcc" sites relative to the underlying Ni) and clearly excludes a surface/subsurface stacking fault (with occupation of "hcp" sites) like that found for similar phases of Sb on Cu(111) and Ag(111). Within the surface alloy layer the Pb atoms are 0.73+/-0.05-Angstrom higher above the surface than the surrounding Ni atoms in the alloy layer. This magnitude of rumpling is in excellent agreement with a recent medium-energy ion scattering investigation of this surface, but is significantly larger than that of an earlier low-energy ion scattering investigation. Compared to the rumpling amplitude of 1.67 Angstrom expected from a simple hard-sphere model based on bulk metallic radii, however, it confirms a strong reduction of the effective atomic radii in this surface alloy.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QC Physics | ||||
Journal or Publication Title: | PHYSICAL REVIEW B | ||||
Publisher: | AMERICAN PHYSICAL SOC | ||||
ISSN: | 1098-0121 | ||||
Official Date: | 15 June 2002 | ||||
Dates: |
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Volume: | 65 | ||||
Number: | 23 | ||||
Number of Pages: | 4 | ||||
Page Range: | - | ||||
DOI: | 10.1103/PhysRevB.65.233404 | ||||
Publication Status: | Published |
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