Free energies of steps on (111) fcc surfaces |
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Authors: | Pepijn R Kole |
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Institution: | Solid State Physics Group, MESA+ Research Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands |
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Abstract: | For a hexagonal two-dimensional lattice we derive, using a surprisingly simple route, exact expressions for the step free energies along the high symmetry directions, 〈1-10〉 and 〈11-2〉. If we consider only nearest-neighbor interactions, ε, and ignore step overhangs the step free energy vanishes at a temperature . In a more sophisticated model that incorporates step overhangs we find a reduction of TR to about 0.87ε/kb. The obtained step free energy expressions are also valid for the free energy of walls between two regions of opposite spins of the triangular 2D Ising system. |
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Keywords: | 68 35 Rh 68 35 Md |
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