颗粒度介导了多次重新进入与负磁阻在无序的TiN薄膜中
Sachin Yadav1,2, R P Aloysius1,2, Govind Gupta1,2
1CSIR-National Physical Laboratory, Dr. K. S. Krishnan Marg, New Delhi, 110012, India.
Scientific reports
|December 20, 2023
概括
研究人员在无序化 (TiN) 薄膜中观察到多个反入阻力状态. 这种与超导体波动相关的现象,提供了对颗粒型超导体行为和量子现象的见解.
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
- 量子现象是一种量子现象.
背景情况:
- 颗粒型超导体作为研究量子现象的模型系统.
- 在这些系统中观察到的反入电阻状态是一个有趣的现象.
研究的目的:
- 报告在一个无序的TiN薄膜中观察到多个重入电阻状态.
- 调查这些回归状态和相关的负磁阻的潜在机制.
主要方法:
- 温度和磁场依赖的电阻测量 (R(T) 和R(B)).
- 对电阻峰值和负磁阻 (MR) 区域的分析.
- 应用基于颗粒度的模型来解释观测.
主要成果:
- 在无序的TiN薄膜中观察到多个重入电阻状态.
- 在零场的R(B) 中的阻力峰值与R(T) 峰值相对应,导致负MR.
- 对垂直和并行磁场均观察到负MR,并行方向的影响更强.
结论:
- 颗粒型超导体中的超导体波动可以导致重新进入状态和负MR.
- 库珀对的形成减少了费米离子通道中的状态密度,导致重新进入的电阻状态.
- 单粒子和库珀通道导电之间的竞争解释了多重电阻回入.
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