TY - JOUR
T1 - Direct observation of the rippling and the order-disorder transition at the Cu3Au(100)) surface by TOF-ion scattering
AU - Houssiau, L.
AU - Bertrand, Patrick
PY - 1996/5/15
Y1 - 1996/5/15
N2 - Low energy ion scattering provides a direct measurement of surface rippling at room temperature, i.e. a relaxation of Au atoms 0.12 Å 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°C below the bulk transition temperature (663 K).
AB - Low energy ion scattering provides a direct measurement of surface rippling at room temperature, i.e. a relaxation of Au atoms 0.12 Å 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°C below the bulk transition temperature (663 K).
UR - http://www.scopus.com/inward/record.url?scp=0030145088&partnerID=8YFLogxK
U2 - 10.1016/0039-6028(95)01311-3
DO - 10.1016/0039-6028(95)01311-3
M3 - Article
AN - SCOPUS:0030145088
SN - 0039-6028
VL - 352-354
SP - 978
EP - 982
JO - Surface Science
JF - Surface Science
ER -