Anisotropy and directional pinning in YBaCuO with BaZrO3 nanorods
  Measurements of anisotropic transport properties (dc and high-frequency regime) of driven vortex matter in YBa$_2$Cu$_3$O$_{7-x}$ with elongated strong-pinning sites (c-axis aligned, self-assembled BaZrO$_3$ nanorods) are used to demonstrate that the effective-mass angular scaling takes place only in intrinsic physical quantities (flux-flow resistivity), and not in pinning-related Labusch parameter and critical currents. Comparison of the dynamics at different time scales shows evidence for a transition of the vortex matter toward a Mott phase, driven by the presence of nanorods. The strong pinning in dc arises partially from a dynamic effect. 
N. Pompeo, A. Augieri, K. Torokhtii, V. Galluzzi, G. Celentano, and E.   Silva
cond-mat.supr-con cond-mat.mtrl-sci