1. Temperature and Magnetic Field Dependence of Critical Current Density of YBCO with Varying Flux Pinning Additions (POSTPRINT)
- Author
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AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH PROPULSION DIRECTORATE, Haugan, Timothy J., Baca, F. J., Mullins, Matthew J., Pearce, Neal A., Campbell, Timothy A., Brewster, Eric L., Barnes, Paul N., Wang, Haiyan, Sumption, Michael D., AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH PROPULSION DIRECTORATE, Haugan, Timothy J., Baca, F. J., Mullins, Matthew J., Pearce, Neal A., Campbell, Timothy A., Brewster, Eric L., Barnes, Paul N., Wang, Haiyan, and Sumption, Michael D.
- Abstract
The critical current density (Jc) of YBa2Cu3O7-z films doped with varying flux pinning nanoparticle additions was systematically studied, for applied magnetic fields of H = 0 -9 T and operation temperatures T = 20 -77 K. Films were prepared with pulsed laser deposition by (M/YBCO)N multilayer or (YBCO)1-x Mx single-target methods, for different M phases including Y2O3, Y2BaCuO5 (Y211) green-phase, and BaZrO3. Very significant differences of Jc (H//c, 20 -77 K) were measured for optimized M phase additions, that are difficult to model or predict at present. Multilayer films with Y211 and Y2O3 nanoparticle additions had the highest Jc (20 -77 K) for H < 4T and YBCO +BZO-nanorod samples had the strongest Jc (H) for H > 4T and 65 -77 K, however not for T < 50 K. Seemingly unusual Jc (H,T) properties were measured for (BZO/YBCO)N multilayer films when compared to YBCO and other doped films; Jc (H) was almost the same as YBCO at 77 K, however at 30 K Jc (H > 2 T) had the strongest properties increasing 70% compared to YBCO +nanoaddition films and increasing 400% compared to YBCO., Published in the Journal of the IEEE Transactions on Applied Superconductivity v19 n3, p3270-3274, June 2009. The original document contains color images. All DTIC reproductions will be in black and white.
- Published
- 2010