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Lars Jansen (1,2), Hendrik Hölscher (3), André Schirmeisen (1,2) (1) Institute of Physics, University of Münster, Germany (2) Center for Nanotechnology (CeNTech), University of Münster, Germany (3) Institut fuer Mikrostrukturtechnik (IMT) Forschungszentrum Karlsruhe GmbH, Germany The stick-slip phenomenon, where the tip of an atomic force microscope performs a saw-tooth like motion over a surface, is believed to be a fundamental process in atomic friction, whose investigation has become a huge challenge over the past years [1,2]. We investigated the influence of temperature on the stick-slip motion in terms of thermal noise and measured atomically resolved stick-slip friction on a clean graphite surface by means of atomic force microscope under ultrahigh vacuum conditions in a temperature range from 100 K to 300 K. We show the results of our experiments concerning the maximum slip-inducing forces as a function of sliding velocity for different temperatures. Furthermore we compare our experimental results to the thermally activated Prandtl-Tomlinson-model as described by Sang et al. and Riedo et. al. [3,4] for high sliding velocities and discuss deviations from this model observed for slow sliding velocities. [1] Schirmeisen, Jansen, Fuchs, PRB 71, p. 245403 (2005) [2] Evstigneev, Schirmeisen, Jansen, Fuchs, Reimann, PRL 97, p. 240601 (2006) [3] Sang, Dubé, Grant, PRL 87, p. 174301 (2001) [4] Riedo, Gnecco, Bennewitz, Meyer, Brune, PRL 91, p. 084502 (2003) |
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