Glassy behavior of vortex liquid in high-T_c superconducting thin films

In the presence of pinning, two vortex-liquid regions were identified: a glassy liquid (GL), where vortices remain coupled in the ab plane as manifested by non-Ohmic resistivity, and a regular liquid (RL), where resistivity becomes Ohmic as vortices become decoupled. The field dependence of the Hall angle is linear in the RL and nonlinear in the GL. Since the boundary (H_k-T) between the GL and RL shifts to higher temperatures and magnetic fields as pinning increases, vortices may be decoupled and depinned simultaneously when the H_k-T line merges into the vortex depinning line.