Article ID Journal Published Year Pages File Type
5425105 Surface Science 2008 7 Pages PDF
Abstract
Structures of Gd adsorbed layers on the Mo(1 1 0) surface have been investigated by LEED and STM methods. In general, the structures of Gd layers are found to be similar to those observed for various rare earth metals on (1 1 0) surfaces of bcc transition metals, but at low Gd coverages demonstrate a rich amount of dilute (n × 2) structures, which can be explained as forming zigzag chains oriented along the [11¯0] direction. Remarkably large spacing between the chains, up to 35 Å, has been observed for the most dilute (22 × 2) structure. First-principle DFT calculations indicate that at low coverage Gd atoms occupy quasi threefold hollow sites on the Mo(1 1 0) surface and that forming zigzag chains correspond to lower total energy with regard to a uniform distribution of linear chains. Forming chain structures are suggested to be a result of indirect lateral interaction between Gd adatoms. Performed Monte Carlo simulations provide clear evidence in support of this interpretation.
Related Topics
Physical Sciences and Engineering Chemistry Physical and Theoretical Chemistry
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