%0 Journal Article
%A Stasevich, T. J.
%A Einstein, T. L.
%A Zia, R. K. P.
%A Giesen, M.
%A Ibach, H.
%A Szalma, F.
%T Effects on next-nearest-neighbor interactions on the orientation dependence of step stiffness: Reconciling theory with experiment for Cu(001)
%J Physical review / B
%V 70
%N 24
%@ 1098-0121
%C College Park, Md.
%I APS
%M PreJuSER-43042
%P 245404
%D 2004
%Z Record converted from VDB: 12.11.2012
%X 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, nonpairwise) 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).
%K J (WoSType)
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000226112300087
%R 10.1103/PhysRevB.70.245404
%U https://juser.fz-juelich.de/record/43042