Investigation of the “Vortex Shaking” Effect via Microwave Absorption 
In High Anisotropy Superconductors BSCCO

D. Shaltiel

Rakah Institute of Physics. The Hebrew University, Jerusalem Israel

The “vortex shaking” effect, in which an ac magnetic field baca-b drives the vortex lattice towards thermodynamic equilibrium, is studied in BSCCO via the microwave dissipation induced by the ac magnetic field. The experiment shows a very complicated behavior as a function of temperature, dc field, ac field crystal orientation and ac frequency. At dc fields, lower than 0.0025T with Bdca-b, the microwaves interact with individual vortices. It is shown for the first time that at dc fields higher than 0.004T the ac field can induce simultaneously collective motion of pinned staircase vortices and Josephson unpinned vortices. The results may indicate that the ac field induces Josephson vortex oscillations at microwave frequencies.