概括
高电流超导薄膜没有粒度边界,与性能较低的样本不同. 这种缺失是实现这些先进超导材料高临界电流密度的关键.
科学领域:
- 材料科学 材料科学 材料科学
- 凝聚物质物理学 凝聚物质物理学
- 超导电性 超导电性 超导电性
背景情况:
- 超导膜对于高电流应用至关重要.
- 了解微观结构对于优化临界电流密度至关重要.
- 之前的研究指出,超导特性存在差异.
研究的目的:
- 研究具有高临界电流密度的超导薄膜的微观结构.
- 为了确定与卓越的超导性能相关的微观结构特征.
- 确定微结构元件在限制临界电流中的作用.
主要方法:
- 超导膜的微结构分析.
- 高和低临界电流密度样本之间的比较.
- 鉴定特征技术用于识别晶体学特征和缺陷.
主要成果:
- 高临界电流密度薄膜是表轴的.
- 这些膜含有双胞胎和沉物.
- 主要的区别是与低电流样本相比,没有粒度边界.
结论:
- 颗粒边界阻碍了超导膜中的临界电流密度.
- 经轴生长,双胞胎和沉与高临界电流兼容.
- 消除粒度边界是提高超导性能的一个关键策略.
相关概念视频
01:28Types Of Superconductors
A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
01:24Superconductor
A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...