Epitaxial growth of magnesium on Ru(0001)
- 15 August 1993
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 48 (8), 5572-5578
- https://doi.org/10.1103/physrevb.48.5572
Abstract
The type of growth and the local geometry of magnesium adsorbed on Ru(0001) were investigated by low-energy electron diffraction (LEED), work-function measurements, and thermal-desorption spectroscopy. Despite the large initial dipole moment of 4.5 D the LEED pattern revealed a hexagonal superstructure even at low global Mg coverage (≥0.05) with local coverage =0.65 indicating island growth. In contrast to most alkali-metal/metal systems, where liquidlike adlayers are formed for coverages lower than 0.25, the repulsive dipole-dipole interaction is overcompensated by the overlap of wave functions due to the existence of two valence electrons. During completion of the first monolayer (=0.75) the hexagonal superstructure is slightly compressed along the high-symmetry directions of the Ru substrate. This compression is completed when the Mg-Mg distance reaches the corresponding bulk value. Further deposition of Mg leads to a multilayer growth (most likely layer by layer). For such an epitaxially grown, 9-ML thick Mg film on Ru(0001), a LEED structural analysis was performed which revealed Mg bulklike values for the interlayer spacings.
Keywords
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