Dynamic Phase Diagram of Driven Vortices in Bi2Sr2CaCu2O y

The coupled study of noise spectra and ac-dc interference effects was performed to clarify the evolution of the driven vortex state of Bi₂Sr₂CaCu₂O_y single crystals. Broadband noise and interference effects were observed in different regions of the H-T-J (H is magnetic field, T is temperature, and J is driving current density) space, which was closely connected with the change of the dynamic phase of the vortices. The obtained H-T-J phase diagram of driven vortices was found to be rather different from those in conventional superconductors, and those expected by numerical simulations.