Estimation of <f>E–J</f> characteristics in a YBCO coated conductor at low temperature and very high magnetic field

<f>E–J</f> characteristics in a YBCO coated conductor at low temperature and very high magnetic field up to 27 T have been estimated using experimental <f>E–J</f> characteristics below 12 T along with a scaling analysis based on the percolation model. 1 mm thick YBCO films was deposited on a biaxially aligned Y2O3/YSZ/Hastelloy substrate fabricated by the IBAD technique. The critical current <f>Ic</f> for the 1 cm wide tape was 85 A at 77 K in self-field. We measured <f>E–J</f> characteristics in perpendicular field up to 12 T using 100 μm wide and 1 mm long bridge patterned in the tape. Statistic <f>Jc</f> distribution and pinning properties were analyzed from the <f>E–J</f> characteristics. Using the pinning parameters determined by the scaling analysis, we can calculate the critical current properties as a function of temperature and magnetic field. <f>E–J</f> characteristics at low temperature and very high magnetic field up to 27 T were estimated analytically and compared with the experimental data. Estimated value of <f>Jc</f> and <f>n</f>-value, and their error analysis were also discussed. [Copyright &y& Elsevier]