Orientation Dependence of Step Stiffness: Failure of SOS and Ising Models to Describe Experimental Data

Details Orientation Dependence of Step Stiffness: Failure of SOS and Ising Models to Describe Experimental Data Orientation Dependence of Step Stiffness: Failure of SOS and Ising Models to Describe Experimental Data

2003-01-30

arxiv.org/abs/cond-mat/0301576v1

Phys. Rev. B 67, 121410(R) (2003)

Physics

Condensed Matter

Materials Science

5 pages, 2 figures

Scientific paper

10.1103/PhysRevB.67.121410

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 (SOS) 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.

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