Abstract
Three-dimensional crystallites of Pb, equilibrated at various temperatures and imaged by scanning tunneling microscopy at temperature, have provided the basis for a quantitative determination of absolute step free energies and kink formation energies of vicinal Pb(1 1 1) surfaces. The anisotropy of large (1 1 1) facets was evaluated as a function of temperature. Products of radius times local curvature for A- and B-steps of these facets were calculated and their dependence on temperature fitted by theoretical expressions. Absolute values of step energies at 0 K are f 1A(0)=131 meV and f 1B(0)=117 meV, with the corresponding kink energies of ε kA=40.0 meV and ε kB=60.3 meV.
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