Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session U49: Superconductivity: Response to Electromagnetic Fields (Optical and Raman Spectroscopy, Surface Impedance, Etc.)
2:30 PM–5:06 PM,
Thursday, March 5, 2020
Room: Mile High Ballroom 1B
Sponsoring Unit: DCMP
Chair: Richard Klemm, Univ of Central Florida
Abstract: U49.00012 : Non-linear Vortex Dynamics and Dissipation at High-amplitude Microwave Drive
Experimental data of vortex surface resistance in bulk niobium elliptical cavities as a function of frequency, trapped magnetic field value and field amplitude will be presented. Numerical calculations of non-linear vortex dynamics under microwave drive for different pinning landscapes allows to describe the mechanism underneath the electromagnetic field amplitude dependence of the surface resistance due to trapped vortices, pointing to the progressive microwave depinning as the most likely mechanism capable to generate such non-linearities.
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