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O: Fachverband Oberflächenphysik
O 21: Poster: Scanning Probe Techniques
O 21.3: Poster
Montag, 27. März 2023, 18:00–20:00, P2/EG
atomic friction on TaS2 over a phase transition — •Yiming Song1, Dirk Dietzel1,2, and Andre Schirmeisen1,2 — 1Institute of Applied Physics (IAP), Justus-Liebig-Universität Gießen, 35392 Gießen, Germany — 2Center for Materials Research, Justus-Liebig-Universität Gießen, 35392 Gießen, Germany
Friction force microscopy experiments were performed on tantalum disulfide (TaS2) surfaces as a function of temperature over the phase transition from nearly commensurate charge density wave (NCDW) phase to commensurate CDW phase. A giant frictional peak at the temperature of 187 K which separates CCDW and NCCDW phases when the sample is cooled down is observed. This behavior was investigated in detail by comparing atomic stick-slip motion of the single asperity AFM tip over phase transition. The hysteresis of the first order structural transformation is revealed in stick-slip behaviors during the heating up procedure as well. Besides, the load and velocity dependence of friction on TaS2 surface in CCDW and NCCDW phases have been revealed.