This title appears in the Scientific Report : 2003 

Orientation dependence of step stiffness: Failure of SOS and Ising Models to describe experimental data
Dieluweit, S.
Ibach, H. / Giesen, M. / Einstein, T. L.
Institut für Grenzflächen und Vakuumtechnologien; ISG-3
Institut für biologisch-anorganische Grenzflächen; ISG-4
Physical review / B, 67 (2003) S. R121410-1 - R121410-4
College Park, Md. APS 2003
R121410-1 - R121410-4
10.1103/PhysRevB.67.121410
Journal Article
Kondensierte Materie
Physical Review B 67
J
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Please use the identifier: http://hdl.handle.net/2128/2146 in citations.
Please use the identifier: http://dx.doi.org/10.1103/PhysRevB.67.121410 in citations.
We have investigated the step stiffness on Cu(001) surfaces as a function of step orientation by two independent methods at several temperatures near 300 K. Both sets of data agree well and show a substantial dependence of the stiffness on the angle of orientation. With the exception of steps oriented along [110], the experimental stiffness is significantly larger than the stiffness calculated within the solid-on-solid model and the Ising model, even if next-nearest-neighbor interactions are taken into account. Our results have considerable consequences for the understanding and for the theoretical modeling of equilibrium and growth phenomena, such as step meandering instabilities.