マルチプルーム•マルチターンPLD法による高I_c YBCO長尺線材

抄録

We have investigated YBa₂Cu₃O_7-X (YBCO) coated conductor fabricated using a multi-plume and multi-turn (MPMT) pulsed-laser deposition (PLD) method. MPMT-PLD has been improved to a technique that enables the fast deposition of high critical current (I_c) YBCO layer for a long coated conductor fabrication. We used a substrate that a CeO₂ cap layer deposited by PLD method on a Gd₂Zr₂O₇ (GZO) buffered Hastelloy tape using the ion-beam assisted deposition (IBAD) method. The YBCO layer was deposited using MPMT-PLD and reel-to-reel tape transfer system. We attained the highest I_c of 313 A at a tape speed of 3.33 m/h using the MPMT-PLD method on a short sample. Then, we successfully deposited a 212.6 m-long YBCO layer at a tape speed of 3.75 m/h using the MPMT-PLD method. This YBCO coated conductor had a high I_c as high as 245 A, and the multiplication of I_c and length exhibited a high value of 52,087 A·m.