Microwave losses in type II superconductors in a magnetic field Theory of direct and modulated absorption

摘要: Abstract The mechanism of direct and modulated microwave (MW) absorption in type II superconductors a magnetic field is elaborated theoretically. MW losses are described terms the viscous motion flux lines. effective pinning lines assumed to be controlled by critical state magnetization current. Reversal current upon external sweep reversal accompanied depinning For periodical modulation this effect leads appearance dependent component absorption. proposed model generalized order account for different loss mechanisms, e.g. weak links high-temperature superconductors.