Title :
Fabrication of High- Jc NdBa2Cu3O7−δ and BaZrO3-doped
Author :
Wee, S.H. ; Goyal, A. ; Martin, P.M. ; Li, J. ; Paranthaman, M. ; Heatherly, L.
Author_Institution :
Oak Ridge Nat. Lab., Oak Ridge
fDate :
6/1/2007 12:00:00 AM
Abstract :
Critical current densities (Jc) over 2 MA/cm2 have been obtained for epitaxial NdBa2Cu3O7-delta (NdBCO) films deposited via pulsed laser deposition on RABiTS having the configuration of Ni - 3at.%W /Y2O3/YSZ/CeO2. Compared to YBa2Cu3O7-delta (YBCO) films on RABiTS, enhanced Jc in applied magnetic fields is observed for the NdBCO films. Further improvement in in-field Jc is achieved by incorporation of self-assembled BaZrO3 (BZO) nanodots within the NdBCO film. At intermediate fields Jc varies as Jc ~ H-alpha, with alpha values for un-doped and BZO-doped films being ~0.43 and ~0.37 respectively, significantly lower than alpha ~ 0.52 for pure YBCO films. Combined effects of better pinning in NdBCO films over YBCO films as well as creation of columnar defects via incorporation of self-assembled BZO nanodots, result in significant improvement over pure YBCO films on RABiTS.
Keywords :
barium compounds; critical current density (superconductivity); crystal defects; flux pinning; high-temperature superconductors; nanostructured materials; neodymium compounds; pulsed laser deposition; quantum dots; rolling; self-assembly; sodium compounds; superconducting epitaxial layers; surface texture; NdBa2Cu3O7-delta; NdBa2Cu3O7-delta:BaZrO3; columnar defects; critical current density; epitaxial film deposition; flux pinning; nanodots; pulsed laser deposition; rolling-assisted biaxially textured substrates; self-assembly; Critical current density; Fabrication; High temperature superconductors; Magnetic fields; Magnetic films; Optical pulses; Pulsed laser deposition; Self-assembly; Superconducting films; Yttrium barium copper oxide; ${rm BaZrO}_{3}$ nanodots; ${rm NdBa}_{2}{rm Cu}_{3}{rm O}_{7-delta}$ films; RABiTS; critical current density; flux-pinning;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2007.899372
