Orientation dependence of the Cu(001) surface step stiffness: Failure of solid-on-solid and Ising models to describe experimental data

Article

关键词: SCANNING TUNNELING MICROSCOPE;    EQUILIBRIUM CRYSTAL SHAPES;    VICINAL SURFACES;    ISLAND SHAPE;    NONLINEAR EVOLUTION;    FLOW GROWTH;    FLUCTUATIONS;    ENERGIES;    TEMPERATURE;    DIFFUSION;   

DOI  :  10.1103/PhysRevB.67.121410

来源: SCIE

【 摘 要 】

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.

【 授权许可】

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