Peak Effect versus Skating in High Temperature Nanofriction

Details Peak Effect versus Skating in High Temperature Nanofriction Peak Effect versus Skating in High Temperature Nanofriction

2007-03-13

arxiv.org/abs/cond-mat/0703329v1

Nature Materials 6, 230 (2007)

Physics

Condensed Matter

Materials Science

5 pages, 6 figures

Scientific paper

10.1038/nmat1836

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.

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