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High magnetic field properties of critical current density in Y1Ba2Cu3O7-δ coated conductor fabricated by improved TFA-MOD process

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14 Author(s)
Inoue, M. ; Dept. of Electr. & Electron. Syst. Eng., Kyushu Univ., Fukuoka, Japan ; Kiss, T. ; Tsuda, Y. ; Sawa, H.
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Current transport characteristics in a Y1Ba2Cu3O7-δ (YBCO) coated conductor fabricated by a trifluoroacetates-metal organic deposition (TFA-MOD) process were investigated over a wide range of temperature and magnetic field up to 25 T. Improved TFA-MOD process was successfully introduced for the better property of critical current density, Jc, at high magnetic fields. The Jc and critical current, Ic, values of multi-coated film with 1.2 μm thickness and 1 cm width were 2.1 MA/cm2 and 251 A at 77 K in self-field. Additionally, the superior Jc properties remained even at high magnetic fields over 20 T and lower temperature, e.g. Jc value at 30 K in 25 T was 1.0 MA/cm2. The Jc value was about 2.5 times higher than those of previous TFA-MOD process at wide range of magnetic field. Moreover, the statistical distribution of Jc in the conductor was also estimated within a framework of the percolation model. The uniformity in the YBCO coated conductor was improved by optimizing the TFA-MOD process.

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Applied Superconductivity, IEEE Transactions on  (Volume:15 ,  Issue: 2 )