Physics – Condensed Matter – Materials Science
Scientific paper
2004-08-23
Phys. Rev. B 70, 245404 [7 pp.]. (2004)
Physics
Condensed Matter
Materials Science
8 pages, 3 figures, submitted to Phys. Rev. B
Scientific paper
10.1103/PhysRevB.70.245404
Within the solid-on-solid (SOS) approximation, we carry out a calculation of the orientational dependence of the step stiffness on a square lattice with nearest and next-nearest neighbor interactions. At low temperature our result reduces to a simple, transparent expression. The effect of the strongest trio (three-site, non pairwise) interaction can easily be incorporated by modifying the interpretation of the two pairwise energies. The work is motivated by a calculation based on nearest neighbors that underestimates the stiffness by a factor of 4 in directions away from close-packed directions, and a subsequent estimate of the stiffness in the two high-symmetry directions alone that suggested that inclusion of next-nearest-neighbor attractions could fully explain the discrepancy. As in these earlier papers, the discussion focuses on Cu(001).
Einstein T. L.
Giesen Margret
Ibach Harald
Stasevich T. J.
Szalma Ferenc
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