Fabrication of high Jc YBa2Cu3O7-x coated conductors prepared by pulsed laser deposition on self-epitaxial CeO2 buffers

In order to fabricate a YBa2Cu3O7-x (YBCO) coated conductor with high critical current density, J(c), we have been investigating the pulsed laser deposition (PLD) processing using the "self-epitaxial" PLD-CeO2 layer on an ion beam assisted deposition (IBAD)-Gd2Zr2O7 (GZO) buffered Hastelloy tape. For the study using short samples with 10 mm in length and 10 mm in width, the J(c) value of YBCO increased exponentially with decreasing the in-plane grain alignment of YBCO and CeO2 layers, and then the J(c) value of 4.4 x 10(10) A/m(2) was attained at the delta phi value of 2.4 degrees. Furthermore, we also succeeded in deposition of high J(c) and thick YBCO film; the thickness of 1.2 mum and the J(c) value of 2.3 x 10(10) A/m(2). This value corresponds to 276 A/cm-width. Based on these results, 0.9 m to 10 m long YBCO coated conductors were fabricated using the reel-to-reel system. Consequently, I-c and J(c) values attained 36.4 A and 7.3 x 10(9) A/m(2) in the 0.9 to long sample with the thickness of 0.5 mum and 20.5 A and 5.4 x 10(9) A/m(2) in the 4.5 m long sample with the thickness of 0.38 mum, respectively.