Free energies of steps on (111) fcc surfaces

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Kole, Pepijn R. and Vries, Rein J. de and Poelsema, Bene and Zandvliet, Harold J.W. (2005) Free energies of steps on (111) fcc surfaces. Solid State Communications, 136 (6). pp. 356-359. ISSN 0038-1098

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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, left angle bracket1–10right-pointing angle bracket and left angle bracket11–2right-pointing angle bracket. If we consider only nearest-neighbor interactions, ε, and ignore step overhangs the step free energy vanishes at a temperature View the MathML source. 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.
Item Type:Article
Copyright:© 2005 Elsevier Ltd
Faculty:
Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/73067
Official URL:http://dx.doi.org/10.1016/j.ssc.2005.08.008
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Metis ID: 227136