Houssiau, L.
Bertrand, Patrick
[UCL]
Low energy ion scattering provides a direct measurement of surface rippling at room temperature, i.e. a relaxation of Au atoms 0.12 Angstrom above the Cu atoms in the outermost layer, which is unambiguously terminated by a mixed and ordered CuAu layer. It is shown that the technique, which is sensitive to the locations of atoms at the first monolayer, is also sensitive to the order-disorder transition in this layer. The occurrence of disorder modifies the arrangement of the atomic rows and then changes the double scattering conditions for low incident angles. As a result, the Au signal decreases significantly at the transition temperature. This effect is continuous and starts at about 50 degrees C below the bulk transition temperature (663 K).
Bibliographic reference |
Houssiau, L. ; Bertrand, Patrick. Direct observation of the rippling and the order-disorder transition at the Cu3Au(100) surface by TOF-ion scattering. In: Surface Science, Vol. 352, p. 978-982 (1996) |
Permanent URL |
http://hdl.handle.net/2078.1/62894 |