2010/08/12 by Ernst Helmut Brandt, Brandt, Ernst Helmut
Engineering · Physics and Astronomy · #Magnetic Field Sensors Techniques #Physics of Superconductivity and Magnetism #Superconducting Materials and Applications #cond-mat.supr-con
paper · pdf · doi:10.48550/arxiv.1008.2231
12 pages, 18 figures, for conference proceedings
arxiv created 2010/08/12 · arxiv updated 2010/08/16
The electric losses in a bulk or film superconductor exposed to a parallel radio-frequency magnetic field may have three origins: In homogeneous vortex-free superconductors losses proportional to the frequency squared originate from the oscillating normal-conducting component of the charge carriers which is always present at temperatures T>0. With increasing field amplitude the induced supercurrents approach the depairing current at which superconductivity breaks down. And finally, if magnetic vortices can penetrate the superconductor they typically cause large losses since they move driven by the AC supercurrent.