在高温超导体中沿着柱状缺陷被困的单个的观察
A Tonomura1, H Kasai, O Kamimura
1Advanced Research Laboratory, Hitachi Ltd, Hatoyama, Saitama 350-0395, Japan. tonomura@harl.hitachi.co.jp
Nature
|August 9, 2001
概括
研究人员可视化了高温超导体中的个别和缺陷. 他们观察到线在高温时与缺陷对齐,但在低温时垂直地穿透,表明结机制的转变.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 材料科学 材料科学 材料科学
- 超导电性 超导电性 超导电性
背景情况:
- 超导体可以允许磁流通过流透,阻碍无散射电流的流动.
- 固定这些极至关重要,特别是对于高过渡温度超导体,其中极很容易移动.
- 由于重离子辐射而产生的柱状缺陷在与线对齐时是最佳的固定点.
研究的目的:
- 在Bi2Sr2CaCu2O8+delta (Bi-2212) 薄膜中实现单个线和柱状缺陷的高分辨率成像.
- 在不同的温度条件下研究和柱状缺陷之间的相互作用.
- 了解Bi-2212超导体中占主导地位的固定机制.
主要方法:
- 使用1MV场发射电子显微镜进行高分辨率成像.
- 准备的Bi2Sr2CaCu2O8+delta (Bi-2212) 薄膜. 薄膜. 已经准备的
- 在不同温度下观察到线行为和柱状缺陷相互作用.
主要成果:
- 在Bi-2212薄膜中成功成像了与柱状缺陷相交的个别线.
- 在更高的温度下,观察到线被捕获并沿着倾斜的柱状缺陷对齐,独立于磁场方向.
- 在较低的温度下,的透始终是垂直于薄膜平面的.
结论:
- 高分辨率电子显微镜可可视化-缺陷相互作用.
- 在Bi-2212超导体中,占主导地位的固定机制随着温度的下降,从柱状缺陷转变为内在背景固定.
- 了解这些固定动态对于高过渡温度超导体的应用至关重要.
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