Dresden 2020 – wissenschaftliches Programm
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CPP 93.8: Vortrag
Donnerstag, 19. März 2020, 12:15–12:30, WIL C107
Single Asperity Sliding Friction across the Superconducting Phase Transition — Wen Wang, •Dirk Dietzel, and Andre Schirmeisen — Instititute of Applied Physics, Justus Libieg Universtity Giessen, 35392 Giessen, Germany
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. 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 cool- ing below the superconducting phase transition Tc. 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.