Kim Ho-Sup, Oh Sang-Soo, Ha Hong-Soo, Youm Dojun, Moon Seung-Hyun, Kim Jung Ho, Dou Shi Xue, Heo Yoon-Uk, Wee Sung-Hun, Goyal Amit
Korea Electrotechnology Research Institute, Changwon, Gyeongnam 641-120, Korea.
Korea Advanced Institute of Science & Technology, Daejon, Korea.
Sci Rep. 2014 Apr 22;4:4744. doi: 10.1038/srep04744.
Long-length, high-temperature superconducting (HTS) wires capable of carrying high critical current, Ic, are required for a wide range of applications. Here, we report extremely high performance HTS wires based on 5 μm thick SmBa2Cu3O7--δ (SmBCO) single layer films on textured metallic templates. SmBCO layer wires over 20 meters long were deposited by a cost-effective, scalable co-evaporation process using a batch-type drum in a dual chamber. All deposition parameters influencing the composition, phase, and texture of the films were optimized via a unique combinatorial method that is broadly applicable for co-evaporation of other promising complex materials containing several cations. Thick SmBCO layers deposited under optimized conditions exhibit excellent cube-on-cube epitaxy. Such excellent structural epitaxy over the entire thickness results in exceptionally high Ic performance, with average Ic over 1,000 A/cm-width for the entire 22 meter long wire and maximum Ic over 1,500 A/cm-width for a short 12 cm long tape. The Ic values reported in this work are the highest values ever reported from any lengths of cuprate-based HTS wire or conductor.
许多应用都需要能够承载高临界电流Ic的长长度高温超导（HTS）导线。在此，我们报道了基于在织构化金属模板上5μm厚的SmBa2Cu3O7–δ（SmBCO）单层膜的超高性能HTS导线。通过在双室中使用批量式滚筒的经济高效、可扩展的共蒸发工艺沉积了超过20米长的SmBCO层导线。通过一种独特的组合方法优化了所有影响薄膜组成、相和织构的沉积参数，该方法广泛适用于包含多种阳离子的其他有前景的复杂材料的共蒸发。在优化条件下沉积的厚SmBCO层表现出优异的立方对立方外延。在整个厚度上如此优异的结构外延导致了极高的Ic性能，对于整个22米长的导线，平均Ic超过1000 A/cm宽度，对于12厘米长的短带，最大Ic超过1500 A/cm宽度。本工作报道的Ic值是基于铜酸盐的HTS导线或导体在任何长度下所报道的最高值。
