Abstract
Critical current densities (Jc) over 2 MA/cm2 have been obtained for epitaxial NdBa2Cu7-δ (NdBCO) films deposited via pulsed laser deposition on RABiTS having the configuration of Ni - 3at.%W /Y2O3/YSZ/CeO2. Compared to YBa 2Cu3O7-δ (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-a, with α values for un-doped and BZO-doped films being ~0.43 and ~0.37 respectively, significantly lower than α ~ 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.
Original language | English |
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Pages (from-to) | 3672-3674 |
Number of pages | 3 |
Journal | IEEE Transactions on Applied Superconductivity |
Volume | 17 |
Issue number | 2 |
DOIs | |
State | Published - Jun 2007 |
Funding
S. H. Wee and J. Li would like to thank Oak Ridge Associated Universities for a postdoctoral fellowship. Manuscript received August 29, 2006. This work was supported by the U.S. Department of Energy, Office of Electricity Delivery and Energy Reliability-Superconductivity Program, under contract DE-AC05-00OR22725 with UT-Bat-telle, LLC.
Keywords
- BaZrO nanodots
- Fluxpinning
- NdBa CuO films
- RABiTS
- critical current density