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Abstract
The step stiffness, step interaction and kink formation energies of steps vicinal to (111) have been derived from the equilibrium shape of a (111) facet on a small three-dimensional Pb crystal imaged by scanning tunneling microscopy. In addition, the azimuthal dependence of the step free energy for vicinal (111) surfaces has been obtained by an ‘inverse’ Wulff construction from the facet shape. Most of these energetic quantities can be quoted for both types of step (A- and B-steps). By also taking into account the curved portion of the vicinal surface, consisting primarily of B-steps, the entropic and total step interaction energy of B-steps can be separately obtained.
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