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Roughening on (11m) Metal Surfaces
Abstract The roughening of stepped metal surfaces has been demonstrated on Ni(11m) and Cu(11m) surfaces [1, 2, 3]. Roughening of these surfaces proceeds reversibly by the spontaneous formation of kinks along the (001) terraces when T > TR, the roughening temperature (see Fig. 1a). Two Models, the Body-Centered Solid-on-Solid (BCSOS) [4] and the Terrace-Step-Kink (TSK) [5, 6, 7], have been proposed to describe the transition. Both Models predict that the transition to the rough phase is of the Kosterlitz-Thouless (KT) universality class [8]. Indeed, experimental results for Ni(115), Ni(113), and Cu(115) agree quantitatively with several KT predictions. While both models lead to a KT transition, the predicted symmetry of the rough phase is quite different in the two cases. In this review we present evidence from helium diffraction experiments indicating that the rough phase is isotropic, meaning that fluctuations of the terrace edges and the terrace widths are comparable. These experiments support the BCSOS model and suggest that more realistic interaction between kinks reflect the isotropic nature of the BCSOS potential. Time-of-Flight (TOF) experiments show that the transition to the rough phase is consistent with a KT singularity to within the finite resolution of the instrument.
Roughening on (11m) Metal Surfaces
Abstract The roughening of stepped metal surfaces has been demonstrated on Ni(11m) and Cu(11m) surfaces [1, 2, 3]. Roughening of these surfaces proceeds reversibly by the spontaneous formation of kinks along the (001) terraces when T > TR, the roughening temperature (see Fig. 1a). Two Models, the Body-Centered Solid-on-Solid (BCSOS) [4] and the Terrace-Step-Kink (TSK) [5, 6, 7], have been proposed to describe the transition. Both Models predict that the transition to the rough phase is of the Kosterlitz-Thouless (KT) universality class [8]. Indeed, experimental results for Ni(115), Ni(113), and Cu(115) agree quantitatively with several KT predictions. While both models lead to a KT transition, the predicted symmetry of the rough phase is quite different in the two cases. In this review we present evidence from helium diffraction experiments indicating that the rough phase is isotropic, meaning that fluctuations of the terrace edges and the terrace widths are comparable. These experiments support the BCSOS model and suggest that more realistic interaction between kinks reflect the isotropic nature of the BCSOS potential. Time-of-Flight (TOF) experiments show that the transition to the rough phase is consistent with a KT singularity to within the finite resolution of the instrument.
Roughening on (11m) Metal Surfaces
Conrad, E. H. (author) / Allen, L. R. (author) / Blanchard, D. L. (author) / Engel, T. (author)
1988-01-01
6 pages
Article/Chapter (Book)
Electronic Resource
English
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