High-Frequency Absorption of the Dynamic Mixed State in the Surface Superconductivity Region

摘要

We analyze the absorption of a high-frequency electromagnetic field in the type II superconductor Pb_(0.8)In_(0.2) in magnetic fields H_(c2) < H < H_(c3). The absorption component proportional to the rate of variation of the external magnetic field is detected. We assume that this absorption component is associated with the dynamic mixed state of the superconducting shell containing 2D magnetic flux vortices (Kulik vortices). The motion of these vortices under the action of the critical current ensures the required difference between the external and internal magnetic inductions of the superconducting shell upon a change in the external magnetic field. This model correctly describes the observed behavior of absorption of rf electromagnetic radiation.