Free energies of steps on (111) fcc surfaces


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.
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Copyright:© 2005 Elsevier Ltd
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