Temperature and Magnetic Field Dependence of Critical Current Density of YBCO with Varying Flux Pinning Additions (POSTPRINT)
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 2010
- Accession Number
- ADA520766
Entities
People
- Eric L. Brewster
- F. J. Baca
- Haiyan Wang
- Matthew J. Mullins
- Michael D. Sumption
- Neal A. Pearce
- Paul N. Barnes
- Timothy A. Campbell
- Timothy J. Haugan
Organizations
- Air Force Research Laboratory