Abstract
By annealing at 500°C thick deposits of Mn on Pt(1 1 1), a chemically ordered 2×2 surface compound is formed. From a dynamical low energy electron diffraction (LEED) analysis, it consists of a Pt 3Mn(1 1 1) bulk-like structure covered by a Pt layer. A different layered structure of alternated Pt and Pt 3Mn ordered planes is obtained by the same procedure using annealing temperatures of 650°C. The distinction between the two phases is based in measurements by LEED, STM and XRD. One phase evolves to the other via a progressive enrichment of Pt, while keeping the structure and composition of the two outermost layers as the temperature increases.
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