Giant microwave absorption in the vortex lattice in s -wave superconductors

The authors develop here a theory of microwave absorption in superconductors in the presence of a pinned vortex lattice. They show that, in addition to the conventional absorption mechanism associated with the vortex core motion, there is another mechanism of microwave absorption caused by the time dependence of the quasiparticle density of states outside the vortex cores. This mechanism exists even in the absence of vortex motion, and provides the dominant contribution to microwave absorption in a broad range of parameters.