Gigantic Maximum of Nanoscale Noncontact Friction

Details Gigantic Maximum of Nanoscale Noncontact Friction Gigantic Maximum of Nanoscale Noncontact Friction

2010-12-11

arxiv.org/abs/1012.2434v1

Physical Review Letters 105, 236103 (2010)

Physics

Condensed Matter

Materials Science

5 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.105.236103

We report measurements of noncontact friction between surfaces of NbSe$_{2}$ and SrTiO$_{3}$, and a sharp Pt-Ir tip that is oscillated laterally by a quartz tuning fork cantilever. At 4.2 K, the friction coefficients on both the metallic and insulating materials show a giant maximum at the tip-surface distance of several nanometers. The maximum is strongly correlated with an increase in the spring constant of the cantilever. These features can be understood phenomenologically by a distance-dependent relaxation mechanism with distributed time scales.

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