Free energies of steps on (111) fcc surfaces

Pepijn R. Kole, Rein J. de Vries, Bene Poelsema, Henricus J.W. Zandvliet

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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.
Original languageUndefined
Pages (from-to)356-359
Number of pages4
JournalSolid state communications
Issue number6
Publication statusPublished - 2005


  • METIS-227136
  • IR-73067

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