聚焦离子束的电流-电压特征制造的超导曲线
Abhishek Kumar1,2, Sudhir Husale1,2, M P Saravanan3
1Quantum Nanophotonics Metrology Division, CSIR-National Physical Laboratory, Dr K. S. Krishnan Marg, New Delhi 110012, India.
Nanotechnology
|October 4, 2023
概括
我们观察了使用聚焦离子束 (FIB) 技术制造的超导曲线 (MW) 中的中间电阻步骤 (IRS). 这些与相位滑动机制相关的IRS显示出量子应用的潜力.
科学领域:
- 超导电性 超导电性 超导电性
- 凝聚物质物理学 凝聚物质物理学
- 纳米技术 纳米技术
背景情况:
- 纳米线的超导特性对于量子设备至关重要.
- 了解超导体的电阻特征是控制其行为的关键.
- 聚焦离子束 (FIB) 制造提供了对纳米结构的精确控制.
研究的目的:
- 为了研究使用FIB制造的曲线 (MW) 电线的超导特性.
- 分析当前电压特征 (IVC) 中观察到的中间电阻步骤 (IRS).
- 探索温度和磁场对IRS和相位滑动机制的影响.
主要方法:
- 使用FIB.制造各种宽度 (240nm,640nm,850nm) 的圆丝 (MW) 线.
- 测量超导过渡温度 (TC) 和正常状态电阻.
- 分析电流-电压特征 (IVC) 和它们的温度/磁场依赖性.
- 实验数据与弱链诱导热激活相位滑动 (WL-TAPS) 的理论模拟进行比较.
主要成果:
- 超导过渡温度 (TC) 在4.5K至4.60K之间.
- 正常状态电阻明显高于电阻的量子,表明极端的障碍.
- 在所有样本中观察到中间电阻步骤 (IRS),归因于相位滑动 (PS) 机制.
- WL-TAPS模拟显示,对240nm线的协议很好,但对更宽的线的协议不太好.
- 外部磁场影响了IRS特征的演变.
结论:
- 在FIB制造的W线中观察到的IRS归因于相位滑动 (PS) 现象.
- 这些IRS特征,以前没有报告FIB-W曲线的电线,受到温度和磁场的影响.
- 这项研究表明,这些纳米线在量子技术中的潜在应用,例如单光子探测器和博洛米特.
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