关键词: 钇钡铜氧/
二氧化铈插层/
厚膜
English Abstract
Enhanced superconducting properties in MOD-YBCO thick films with CeO2 interlayer
Ding Fa-Zhu1,2,Gu Hong-Wei1,2,
Wang Hong-Yan1,2,
Qu Fei1,2,
Shang Hong-Jing3,
Zhang Hui-Liang1,2,
Dong Ze-Bin1,2,
Zhang He1,2,
Zhou Wei-Wei1,2
1.Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China;
2.Key Laboratory of Applied Superconductivity, Chinese Academy of Sciences, Beijing 100190, China;
3.College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
Fund Project:Project supported by the National Higy Technology Research and Development Program of China (Grant No. 2014AA032702), the National Nature Science Foundation of China (Grant Nos. 51577180, 51272250) and the Beijing Natural Science Foundation, China (Grant No. 2152035).Received Date:11 January 2016
Accepted Date:02 February 2016
Published Online:05 May 2016
Abstract:In YBa2Cu3O7-x (YBCO) film there exists thickness effect: the critical current density of YBCO film drops precipitously as the coating thickness increases, especially in the case that the thickness of YBCO film exceeds 1 m. In this paper, we introduce very thin layers of CeO2 into YBCO layers and successfully fabricate the structure of YBCO/YBCO/CeO2/YBCO superconducting thick film. Firstly, YBCO films with two layers are fabricated on a LaAlO3 substrate by a multiple coatings process using a trifluoroacetate metal organic deposition method. Secondly, CeO2 thin films are deposited on YBCO films by RF-sputtering. Finally, we prepare the third YBCO film on CeO2interlayer. No cracks are observed in scanning electron microscopy images of these films; further, the majority of the grains in the films are well-textured and c-axis oriented. The full-width-half-maximum of the out-of-plane texture is measured to be 1.395 for the multilayer YBCO film at a thickness of 2 m Using this multilayer technology, we achieve Jc values of up to 1.36 MA/cm2 (77 K, self-field) in films as thick as 2 m, for an extrapolated critical current of 272 A/cm. We attribute the enhanced performance of the thick YBCO film to the CeO2 interlayer which playsan important role in transmission texture and stress relaxation.
Keywords: YBa2Cu3O7-x/
CeO2 interlayer/
thick film
