Growth temperature dependence of flux pinning properties in ErBa2Cu3Oy thin films with nano-rods

Irreversibility lines and distributions of local critical current density (J(cl)) based on the percolation transition model were affected by the growth temperature (T-s) in 3.5 wt.%-BaNb2O6-doped ErBa2Cu3Oy thin films. The vortex-Bose-glass-like state appeared by the introduction of nano-rods, and this vortex state was affected by T-s The shape and width of the J(cl) distribution strongly depended on T-s. These results are probably caused by variations of the density and the growth direction for nano-rods reflecting T-s. The growth temperature is an important factor to achieve higher critical current properties under magnetic fields for coated conductors of rare-earth-based cuprates with nano-rods. (C) 2011 Elsevier B.V. All rights reserved.