Gigantic Maximum of Nanoscale Noncontact Friction
classification
❄️ cond-mat.mtrl-sci
keywords
frictionmaximumcantilevernoncontactcoefficientsconstantcorrelateddistance
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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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