Journal
PHYSICAL REVIEW LETTERS
Volume 101, Issue 24, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.101.246105
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Funding
- BMBF [03N8704]
- National Science Foundation [MRSEC DMR 0520495]
- American Chemical Society [PRF 42259- AC5]
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Experiments performed by friction force microscopy at atomic-scale surface steps on graphite, MoS(2), and NaCl in ambient conditions are presented. Both step-down and step-up scans exhibit higher frictional forces at the edge, but distinguish in their load dependence: While the additional frictional force due to the step edge increases linearly with load if the tip has to jump a step up, it remains constant for downward jumps. This phenomenon represents a universal effect that can be explained in terms of a modified Prandtl-Tomlinson model featuring a Schwoebel-Ehrlich barrier at steps.
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