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Anisotropic surface coupling while sliding on dolomite and calcite crystals

AuthorsPina, Carlos M. ; Miranda, Rodolfo; Gnecco, Enrico
Issue Date6-Feb-2012
PublisherAmerican Physical Society
CitationPINA C.M., MIRANDA, R., GNECCO, E. (2012). Anisotropic surface coupling while sliding on dolomite and calcite crystals. Physical Review B, 85, 073402. DOI: 10.1103/PhysRevB.85.073402
AbstractHigh-resolution friction force microscopy has been performed on the (104) surfaces of dolomite and calcite in deionized water. The two rows of oxygen atoms alternating in a zigzag way on top of both surfaces are resolved with similar contrast while scanning along the [421̅ ] direction. Along the [010] direction, only one row is resolved, provided that the normal loading is large enough. The direction-dependent interaction between the probing tip and surface atoms is explained by numeric calculations based on the Prandtl-Tomlinson model.
Publisher version (URL)http://link.aps.org/doi/10.1103/PhysRevB.85.073402
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