期刊
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
卷 21, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0953-2048/21/02/025001
关键词
-
This paper reports a study on mixed rare-earth barium-copper oxide superconducting films (Y0.67Eu0.33)Ba2Cu3O7-delta of different thicknesses grown on single-crystal SrTiO3 substrates by pulsed laser deposition (PLD). X-ray diffraction (XRD), scanning electron microscopy (SEM) and cross-sectional transmission electron microscopy (TEM) were employed to investigate film crystallinity, surface morphology and microstructure. Critical current density in self-field as a function of film thickness and in an applied magnetic field as a function of field strength and direction were also measured. The results show high quality (Y0.67Eu0.33)Ba2Cu3O7-delta films with a smoother and denser surface morphology compared to that of pure YBa2Cu3O7-delta. A thickness-dependent self-field critical current density quantitatively similar to that of pure YBa2Cu3O7-delta. was observed, which suggests that the microstructural evolution in terms of increasing surface roughness and microporosity as well as crystallinity degradation is not likely to be playing a critical role in the form of the dependence. Y0.67Eu0.33)Ba2Cu3O7-delta films also exhibit improved magnetic field performance at low fields over a wide range of orientations in the intermediate angle region, indicating that probable additional random pinning sites were introduced by the substitution of europium in one-third of yttrium sites.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据