Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5492284 | Physica C: Superconductivity and its Applications | 2017 | 6 Pages |
Abstract
Substrate engineering is very significant in the synthesis of the high-temperature superconductor (HTS) coated conductor. Here we design and synthesize several distinct and stable Cerium oxide (CeO2) surface reconstructions which are used to grow epitaxial films of the HTS YBa2Cu3O7-δ (YBCO). To identify the influence of annealing and post-annealing surroundings on the nature of nucleation centers, including Ar/5%H2, humid Ar/5%H2 and O2 in high temperature annealing process, we study the well-controlled structure, surface morphology, crystal constants and surface redox processes of the ceria buffers by using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and field-emission scanning electronic microscopy (FE-SEM), respectively. The ceria film post-annealed under humid Ar/5%H2 gas shows the best buffer layer properties. Furthermore, the film absorbs more oxygen ions, which appears to contribute to oxygenation of superconductor film. The film is well-suited for ceria model studies as well as a perfect substitute for CeO2 bulk material.
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Hu Xuefeng, Zhong Yun, Zhong Huaxiao, Fan Feng, Sang Lina, Li Mengyao, Fang Qiang, Zheng Jiahui, Song Haoyu, Lu Yuming, Liu Zhiyong, Bai Chuanyi, Guo Yanqun, Cai Chuanbing,