SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 91: Poster Session VII: Scanning probe techniques: Method development II
O 91.4: Poster
Donnerstag, 4. März 2021, 10:30–12:30, P
Single Asperity Sliding Friction across the Superconducting Phase Transition — Wen Wang1,2, •Dirk Dietzel1, and Andre Schirmeisen1 — 1Institute of Applied Physics, University of Giessen, 35392 Giessen, Germany — 2School of Mechanical Engineering, Southwest Jiaotong University, 610031 Chengdu, China
In sliding friction, different energy dissipation channels have been proposed, including phonon and electron systems, plastic deformation, and crack formation. However, the details of how energy is coupled into these channels is heavily debated, and especially the relevance of the electron system for energy dissipation often remains elusive. Here, we present contact mode AFM friction experiments of a single asperity sliding on a high-TC BSCCO-superconductor in a wide temperature range from 40 K to 300 K [1]. Overall, friction decreases with temperature as expected based on thermally activated friction models, but we find an unexpected large peak around TC of 95 K. We model these results by a superposition of different energy dissipation channels, where the influence of electronic contributions vanishes when cooling below the superconducting phase transition temperature. Our experiments thereby unambiguously link electronic friction effects to the number of normal state electrons in the superconducting phase below TC, allowing us to quantify the relative importance of the electron system to overall friction.
[1] W. Wang, D. Dietzel, A. Schirmeisen, Science Advances, eaay0165 (2020)