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SURFACE-DIFFUSION OF PB ON (100) CU - COVERAGE DEPENDENCE AND INFLUENCE OF ORDERED-PHASE FORMATION

被引：38
作者：
COHEN, C
GIRARD, Y
LEROUXHUGON, P
LHOIR, A
MOULIN, J
SCHMAUS, D
机构：
[1] Groupe de Physique des Solides, Université Paris 7 and 6, Paris, 75251, URA 017, CNRS
来源：
EUROPHYSICS LETTERS | 1993年 / 24卷 / 09期
关键词：
D O I：
10.1209/0295-5075/24/9/012
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The spread of two-dimensional submonolayer Pb deposits on (100) Cu has been measured as a function of coverage theta and temperature T by Rutherford backscattering in ultra-high vacuum, providing the chemical-diffusion coefficient D(theta, T). An overall increase of D with theta is observed (more than 3 orders of magnitude) with a lowering in the theta and T domain where ordered Pb structures exist. These effects are qualitatively predicted by Monte Carlo simulations in the framework of a simple square lattice gas model with nearest-neighbour repulsive interactions.
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页码：767 / 772
页数：6
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