The crossover from the vortex glass to the Bose glass in nanostructured YBa2Cu3O7-x films

The glass-liquid transitions of quantized vortices were studied to understand the vortex behavior in YBa2Cu3O7-x films. We systematically controlled the pinning strength, spatial distribution, and shape of disorders by engineering of nanoinclusions in YBa2Cu3O7-x films. In these disorder systems, we observed the crossover between the vortex glass (VG) and the Bose glass (BG). The increase in pinning strength and ordering of isotropic disorders do not change the critical exponents and the conversion between the BG and the VG is triggered only by the anisotropy of pinning centers. (c) 2008 American Institute of Physics.