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O: Fachverband Oberflächenphysik
O 4: Tribology: Surfaces and Nanostructures
O 4.2: Vortrag
Montag, 27. März 2023, 10:45–11:00, GER 37
Nanoscale Friction across the First Order Charge Density Wave Phase Transition of 1T-TaS2 — Wen Wang1, •Dirk Dietzel2, and Andrè Schirmeisen2 — 1School of Mechanical Engineering, Southwest Jiaotong University, Chengdu, China — 2Institute of Applied Physics, Justus Liebig University Giessen, Giessen, Germany
In material science, analyzing phase transitions is a fundamental way to understand material properties and their changes on the atomic level. At the same time, phase transition materials are intriguing model systems for nanotribology, where well-defined transformations can occur if a specific control parameter, like e. g. temperature, changes. On one hand, varying friction between tip and sample can be linked to the specific properties of different phases. On the other hand, during the phase transition localized mechanical probing of the surface can allow for a direct coupling to the reorganization of the material as was recently demonstrated for the case of 1T-TaS2 [1]. However, previous experiments did not allow for an in-depth analysis of the influence of crucial parameters like sliding velocity and normal force on the process of local nucleation. This was now done by friction force microscopy on 1T-TaS2 for different stationary temperatures across the charge density wave phase transitions. Our results corroborate an anticipated mechanism, where the AFM-tip gradually induces local transformations of the material close to the spinodal point in a thermally activated and shear assisted process until the surface is fully ’harvested’.
[1] Panizon et al., New Journal of Physics 20, 023033 (2018).