Thickness modulation effect of CeO2 layer for YBCO films grown by pulsed laser deposition

来源 :稀有金属(英文版) | 被引量 : 0次 | 上传用户:liouyun
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
CeO2 film plays an essential role in nucleation and growth of YBa2Cu3O7-x (YBCO) films.In this work,the dependence of superconducting properties of YBCO on CeO2 films with different thicknesses was investigated,in order to achieve fabrication of high-performance YBCO coated conductors in industrial scale.The crystalline structure and morphology of CeO2 films with thickness ranging from 21 to 563 nm were systematically characterized by means of X-ray diffraction (XRD),atomic force microscope (AFM) and reflection high-energy electron diffraction (RHEED).Additional focus was addressed on evolution of the surface quality of CeO2 films with thickness increasing.The results show that at the optimal thickness of 221 nm,CeO2 film exhibits sharp in-plane and out-of-plane texture with full width of half maximum (FWHM) values of 5.9° and 1.8°,respectively,and smooth surface with a mean root-mean-square (RMS) roughness value as low as 0.6 nm.Combing RHEED and transmission electron microscope (TEM) cross-sectional analysis,it is found that nucleation and growth of CeO2 films at early stage remain in island growth mode with rougher surface,while further increasing the thickness beyond the optimal thickness leads to weak surface quality,consequently resulting in degradation of superconductor layers deposited subsequently.Eventually,a critical current density (Jc) as high as 4.6 × 106 A·cm-2 (77 K,self-field) is achieved on a YBCO film on a thickness-modulated CeO2/MgO/Y2O3/Al2O3/C276 architecture,demonstrating the advantages of CeO2 films as buffer layer in high-throughput manufacture of coated conductors.
其他文献
DX-2型电子血压计系用微音器检拾血管音,并经电子线路将声音转变为闪光,同时观察闪光和血压表的指示,即可判断被测者的收缩压和舒张压。 The DX-2 electronic sphygmomanom
To study the influence of aging heat treatments on the microstructure of single crystal superalloys with high content of refractory elements and optimal the agi
中国古代社会男耕女织的经济模式,决定了封建社会以男权为主的社会结构和男尊女卑的社会格局。在中国传统社会中,统治者为了维护宗法等级秩序,巩固封建统治,强化尊卑观念,宣扬“三
随着职业技术院校教学课堂的不断改进和完善,学生的学习兴趣和学习能力得到了显著的提高,但是纵观整体教学模式,教师主导地位的发挥仍然存在一些问题,如何有效地发挥教师主导
以等摩尔分数的Al元素替代(In2Te3)0.09(SnTe)0.91中的In元素,利用放电等离子烧结技术、采用相同的工艺制备了(In2Te3)0.09(SnTe)0.91和(In1.9Al0.1Te3)0.09(SnTe)0.912种化
The high-temperature deformation behavior of a beta Ti-3.0Al-3.5Cr-2.0Fe-0.1B alloy was investigated by a Gleeble-1500D thermal simulator.The height reduction w
采用低频脉冲磁场对非晶合金Fe73.5Cu1Nb3Si13.5B9进行处理,用穆斯堡尔谱和透射电子显微镜分析了脉冲磁场处理前后非晶合金样品的微结构.结果表明,脉冲磁场处理致非晶合金在
小雪有个露台,不仅是植物的天地,更是她心灵的寄放之所。万花丛中过,独饮一杯茶。在每个有阳光的午后,迎来最惬意的放松。露台上的椅子是为朋友们准备的,在喧嚣的都市有这么
[摘 要] 高职院校是培养高素质技能型人才的主要阵地,在新的时代背景下,“工匠精神”成为职业教育关注的重点。高职院校技能大赛体现的工匠精神,集中在“努力学习、锲而不舍、不耻下问、精益求精”等内涵上。高职学院需要深刻认识培养学生工匠精神的必要性,结合时代的需要深化人才培养模式改革,加强学生工匠精神的培育,为未来大国工匠的成长作出应有的贡献。  [关 键 词] 技能大赛;工匠精神;专业技能  [中图分
追问真理是哲学领域永恒的话题。海德格尔对真理的追问与其对存在意义的追问是同步发展的。在追问真理的过程中,海德格尔在强调追问存在的意义的基础上,首先对传统符合论的一些