Friday, 2E-09, -

Angular Dependence of YBCO Coated Conductors at Low Temperature

Aixia Xu

Jan Jaroszynski, Fumitake Kametani, Zhijun Chen, Feng Lu, David Larbalestier

National High Magnetic Field Laboratory, Tallahassee, FL 32310 850-645-7497, 850-645-7754, aixiaxu@asc.magnet.fsu.edu

Yimin Chen, Yi-Yuan Xie, Venkat Selvamanickam

SuperPower Inc., Schenectady, NY 12304

To clarify the pinning mechanism of YBCO coated conductors at very high field and low temperature, we investigated the angular dependence of BZO-doped YBCO coated conductors at fields up to 30T at liquid helium temperature. The samples were grown by the metal organic chemical vapor deposition (MOCVD) method on very strong Hastelloy substrate. The results showed that the c-axis correlated peak of BZO-doped YBCO sample disappeared with the increase of field and was quite absent in fields of 15 T or more. At very high fields where the vortex density is greater than the density of pinning centers, the angular dependence of J_c shows a cusp-like peak which is inconsistent with the Ginzburg-Landau mass anisotropy scaling rule.

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