Peak Effect versus Skating in High Temperature Nanofriction
arXiv:cond-mat/0703329 · doi:10.1038/nmat1836
Abstract
The physics of sliding nanofriction at high temperature near the substrate melting point $\Tmelt$ is so far unexplored. We conducted simulations of hard tips sliding on a prototype non-melting surface, NaCl(100), revealing in this regime two distinct and opposite phenomena for plowing and for grazing friction. We found a frictional drop close to $\Tmelt$ for deep plowing and wear, but on the contrary a frictional rise for grazing, wearless sliding. For both phenomena we obtain a fresh microscopic understanding, relating the former to ``skating'' through a local liquid cloud, the latter to linear response properties of the free substrate surface. It is argued that both phenomena should be pursued experimentally, and much more general than the specific NaCl surface case. Most metals in particular possessing one or more close packed non-melting surface, such as Pb, Al or Au(111), that should behave quite similarly.
5 pages, 6 figures
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Cited by in corpus (5)
- Modeling friction: From nanoscale to mesoscale
- Depinning and nonequilibrium dynamic phases of particle assemblies driven over random and ordered substrates: a review
- Friction and Nonlinear Dynamics
- Disordering Transitions and Peak Effect in Polydisperse Particle Systems
- Alkali Halide Surfaces Near Melting: Wetting and Nanofriction Properties