Influence of Zr and Ce doping on electromagnetic properties of (Gd,Y)-Ba-Cu-O superconducting tapes fabricated by metal organic chemical vapor deposition
Abstract
(Gd,Y)Ba 2Cu 3O x tapes have been fabricated by metal organic chemical vapor deposition (MOCVD) with Zr-doping levels of 0-15 mol.% and Ce doping levels of 0-10 mol.% in 0.4 μm thick films. The critical current density ( Jc) of Zr-doped samples at 77 K, 1 T applied in the orientation of H ‖ c is found to increase with Zr content and shows a maximum at 7.5% Zr doping. The 7.5% Zr-doped sample exhibits a critical current density ( Jc) of 0.95 MA/cm 2 at H ‖ c which is more than 70% higher than the Jc of the undoped sample. The peak in Jc at H ‖ c is 83% of that at H ‖ a- b in the 7.5% Zr-doped sample which is more than twice as that in the undoped sample. Superconducting transition temperature ( Tc) values as high as about 89 K have been achieved in samples even with 15% Zr and 10% Ce. Ce-doped samples with and without Ba compensation are found to exhibit substantially different Jc values as well as angular dependence characteristics.
- Publication:
-
Physica C Superconductivity
- Pub Date:
- December 2009
- DOI:
- 10.1016/j.physc.2009.08.011
- Bibcode:
- 2009PhyC..469.2037S
- Keywords:
-
- 74.72.Bk;
- 74.78.Bz;
- 81.15.Gh;
- 74.25.Qt;
- 74.25.Sv;
- Y-based cuprates;
- High-T<sub>c</sub> films;
- Chemical vapor deposition;
- Vortex lattices flux pinning flux creep;
- Critical currents