Evidence of rf-driven dendritic vortex avalanches in MgB2 microwave resonators
Evidence of rf-driven dendritic vortex avalanches in MgB2 microwave resonators
The influence of dendritic magnetic-flux penetration on the microwave response of superconducting MgB2 films is investigated by a coplanar resonator technique. The peculiar feature consists of jumps in the resonance curve, induced by vortex avalanches freezing flux inside the resonator. Due to a shaking effect, microwave currents maintain the vortex …