High-temperature superconducting thick films with enhanced supercurrent carrying capability
High-temperature superconducting thick films with enhanced supercurrent carrying capability
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DOI：
10.1063/1.1455143
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发表时间：
2002-02
影响因子：
4
通讯作者：
Q. Jia;S. Foltyn;P. Arendt;J. Smith
中科院分区：
文献类型：
--
作者：
Q. Jia;S. Foltyn;P. Arendt;J. Smith
我们开发了一种多层结构来提高厚（>1 μm）YBa 2Cu 3 O 7 −x（YBCO）薄膜的超导载流能力。CeO 2的中间层，其功能作为随后的高质量YBCO层的生长的起始模板，被用来禁止微结构缺陷的产生，否则开发在厚YBCO膜的顶部区域。用卢瑟福背散射谱和扫描电子显微镜的沟道数据证实了3.3 μm厚YBCO薄膜的表面质量得到了改善。与我们常规制备的单层YBCO厚膜（其中超导电流随着膜厚度的增加而迅速下降）相比，这种多层膜使得可以保持临界电流密度超过1 MA/cm 2，并且对涂覆导体的厚度限制较少。
We have developed a multilayer architecture to enhance the supercurrent carrying capability of thick (>1 μm) YBa2Cu3O7−x (YBCO) films. An interlayer of CeO2, which functions as a starting template for growth of subsequent high-quality YBCO layers, is used to prohibit the generation of microstructural defects that otherwise develop in the top region of thick YBCO films. Improved surface quality for a 3.3 μm thick YBCO film has been confirmed by the channeling data of Rutherford backscattering spectroscopy and by scanning electron microscopy. Compared to our routinely prepared single-layer YBCO thick film in which the supercurrent drops rapidly with increasing film thickness, this multilayer makes it possible to maintain critical current density over 1 MA/cm2 with less restrictions on the thickness of coated conductors.