Induced microwave interaction with pancake and Josephson vortices by ac magnetic field, in the high anisotropy superconductor Bi-2212

Microwave dissipation of the vortex system induced by an ac field, in the high anisotropy Bi-2212 at dc magnetic fields below 0.05 T is investigated via an ESR spectrometer, where the detected signal is measured with a digital oscilloscope that allows investigation of the time dependence response to the ac field. The results, presented in an ac-dc diagram show three regions where the ac field induces interaction with either pancake vortices or Josephson vortices or simultaneously with both types of vortices. The interaction with only PV or with only JV is linear. It becomes non-linear when the ac field interacts with both types of vortices. The results are discussed in conjunction with recent vortex decoration measurements, which indicate stacks of PV observed on the surface, become trapped on underlying JV vortices implying interaction between the two types of vortices. It raises questions about the nature of this interaction, as in the present work the ac field induces microwave interaction with only one type of vortices at dc fields where the decoration experiments report the trapping of PV by the underlying JV