Fabrication and properties of the meander nanowires based on ultra-thin Nb films
文献类型：期刊论文
| 作者 | Zhao, L ; Jin, YR ; Li, J ; Deng, H ; Zheng, DN |
| 刊名 | CHINESE PHYSICS B
 |
| 出版日期 | 2014 |
| 卷号 | 23期号:8 |
| 关键词 | Nb meander nanowire critical temperature critical field critical current |
| ISSN号 | 1674-1056 |
| 通讯作者 | Zheng, DN (reprint author), Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Inst Phys, Beijing 100190, Peoples R China. |
| 中文摘要 | We report the fabrication and the study of superconducting properties of ultra-thin Nb superconducting meander nanowires, which can be used as superconducting nanowire single-photon detectors (SNSPDs). The ultra-thin (about 7-nm thick) Nb films are patterned into micro-bridges, and 100-nm wide meander nanowires by using e-beam lithography (EBL). The average transition temperature (T-c) of the nanowires is about 4.8 K and the critical current density j(c) is about 2.8 x 10(6) A/cm(2). Superconducting characteristics of the specimens at different applied magnetic fields up to 8 T (parallel or perpendicular to the specimen) are systematically investigated. The normalized temperature t (= T/T-c) dependences of the parallel critical field (H-c parallel to) for both the micro-bridge and the meander nanowire are almost the same, following the Ginzburg and Landau (GL) formalism for ultra-thin films. However, in perpendicular field and in the vicinity of T-c (> 0.95T(c)), the critical field H-c perpendicular to of the nanowire exhibits a down-turn curvature nonlinear temperature dependence while the micro-bridge displays a linear temperature dependence. The nonlinear behavior of H-c perpendicular to in the nanowire is believed to be due to the fact that in the vicinity of T-c the coherence length becomes larger than the line width. Additionally, the localization of carriers in the nanowire could also contribute to the nonlinear behavior. The resistive transitions could be described by the phase-slip model for quasi-one-dimensional system. Moreover, the hysteresis in I-V curve of the meander nanowires can be illustrated by a simple model of localized normal hotspot maintained by Joule heating. |
| 资助信息 | National Basic Research Program of China (973 Program) [2011CBA00106, 2009CB929102]; National Natural Science Foundation of China [11104333, 10974243] |
| 语种 | 英语 |
| 公开日期 | 2015-04-14 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/58991]  |
| 专题 | 物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文 |
| 推荐引用方式 GB/T 7714 | Zhao, L,Jin, YR,Li, J,et al. Fabrication and properties of the meander nanowires based on ultra-thin Nb films[J]. CHINESE PHYSICS B,2014,23(8). |
| APA | Zhao, L,Jin, YR,Li, J,Deng, H,&Zheng, DN.(2014).Fabrication and properties of the meander nanowires based on ultra-thin Nb films.CHINESE PHYSICS B,23(8). |
| MLA | Zhao, L,et al."Fabrication and properties of the meander nanowires based on ultra-thin Nb films".CHINESE PHYSICS B 23.8(2014). |
入库方式： OAI收割
来源：物理研究所
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