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O: Fachverband Oberflächenphysik

O 27: Tribology

O 27.3: Vortrag

Dienstag, 19. März 2024, 11:00–11:15, MA 144

Atomic Friction on 1T-TaS2 over a Phase Transition — •Yiming Song, Dirk Dietzel, and Andre Schirmeisen — Institute of Applied Physics (IAP), Justus-Liebig-Universität Gießen, 35392 Gießen, Germany

Friction force microscopy experiments were performed on 1T phase tantalum disulfide (1T-TaS2) surfaces as a function of temperature over the phase transition from nearly commensurate charge density wave (CDW) phase to commensurate CDW phase. While the superstructure can be revealed both in friction and in topography images, friction variation between these two phases is negligible, which is supported by detailed investigation on atomic stick-slip motion of the single asperity AFM tip sliding over 1T-TaS2. Besides, the load and velocity dependence of atomic friction on 1T-TaS2 surface in CCDW and NCCDW phases have been revealed. Using conductive atomic force microscopy, we were able to show the local electric conductivity on NCCDW surface with atomic resolution.

Keywords: atomic friction; stick slip; 1T-TaS2; phase transition; charge density wave