Hysteresis in superconducting short weak links and μ-SQUIDs

Dibyendu Hazra; Laetitia M. A. Pascal; Herve Courtois; Anjan K. Gupta

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Hysteresis in superconducting short weak links and μ-SQUIDs

机译：超导短弱连接和μ-SQUID中的磁滞

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Thermal hysteresis in a micron-size superconducting quantum interference device (μ,-SQUID), with weak links as Josephson junctions, is an obstacle for improving its performance for magnetometry. Following the "hot-spot" model of Skocpol et al. [J. Appl. Phys. 45, 4054 (1974)] and by incorporating the temperature dependence of the superconductor thermal conductivity under a linear approximation, we find a much better agreement with the observed temperature dependence of the retrapping current in short superconducting Nb-based weak links and μ-SQUIDs. In addition, using the temperature dependence of the critical current, we find that above a certain temperature hysteresis disappears. We analyze the current-voltage characteristics and the weak link temperature variation in both the hysteretic and nonhysteretic regimes. We also discuss the effect of the weak link geometry in order to widen the temperature range of hysteresis-free operation.

机译：微米级超导量子干涉装置（μ，-SQUID）中的磁滞是约瑟夫森结的弱环节，这是提高其磁力测量性能的障碍。遵循Skocpol等人的“热点”模型。 [J.应用物理45，4054（1974）]，并且通过在线性近似下并入超导体热导率的温度依赖性，我们发现与基于超短Nb的短导Nb弱连接和μ-SQUID中的俘获电流的温度依赖性更好的一致性。。此外，利用临界电流的温度依赖性，我们发现在一定温度以上，磁滞消失了。我们分析了滞后和非滞后状态下的电流-电压特性和弱链接温度变化。我们还将讨论弱链接几何形状的影响，以扩大无磁滞运行的温度范围。

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《Physical review》 |2010年第18期|p.184530.1-184530.10|共10页
作者
Dibyendu Hazra; Laetitia M. A. Pascal; Herve Courtois; Anjan K. Gupta;
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作者单位

Department of Physics, Indian Institute of Technology Kanpur, Kanpur 208016, India;

Institut Neel, CNRS and Universite Joseph Fourier, 25 avenue des Martyrs, Grenoble, France;

Institut Neel, CNRS and Universite Joseph Fourier, 25 avenue des Martyrs, Grenoble, France;

Department of Physics, Indian Institute of Technology Kanpur, Kanpur 208016, India;

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superconducting films and low-dimensional structures; electronic transport in nanoscale materials and structures; granular; melt-textured; amorphous and composite; superconducting quantum interference devices (squids);

机译：超导膜和低维结构;纳米材料和结构中的电子传输;粒状;熔融纹理无定形和复合材料;超导量子干涉装置（鱿鱼）;

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专利

1. Hysteresis and voltage jumps of transport phenomena due to weak links in high-T-c superconductors [J] . Fukami T Physica, B. Condensed Matter . 1997,第1a2期

机译：高T-c超导体中弱连接导致的传输现象的磁滞和电压跳变
2. Reduction of telegraph noise in superconducting short weak links [J] . Ohta H., Matsui T. IEEE Transactions on Applied Superconductivity . 1995,第期

机译：减少超导短弱链路中的电报噪声
3. Reduction of telegraph noise in superconducting short weak links [J] . Ohta H., Matsui T., Shinada K., IEEE Transactions on Applied Superconductivity . 1995,第2期

机译：减少超导短弱链路中的电报噪声
4. Effect of sintering temperature on the nature of weak links and flux pinning mechanism in La_(1.85)Sr_(0.15)CuO4 superconductor [C] . Devina Sharma, Ranjan Kumar, V P S Awana International Conference on Materials Science and Technology . 2015

机译：烧结温度对LA_（1.85）SR_（0.15）CUO4超导体中LA_（1.85）SR_（0.15）的弱链路性质的影响
5. Fabrication and characterization of weak links anddc SQUIDs in the high-temperature superconductor yttrium barium copper oxide. [D] . Romaine, Suzanne Elizabeth. 1992

机译：高温超导体钇钡氧化铜中弱链接和dc SQUID的制备与表征。
6. Nanopatterning of Weak Links in Superconducting Oxide Interfaces [O] . Gyanendra Singh, Edouard Lesne, Dag Winkler, 2021

机译：超导氧化物界面弱链路的纳米透明仪
7. Hysteresis in superconducting short weak links and $\mu$-SQUIDs [O] . Hazra, Dibyendu, Pascal, Lætitia, Courtois, Hervé, 2010

机译：超导短链路中的滞后现象和$ \ mu $ -sQUIDs
8. Use of Superconducting Imaging Surfaces to Enhance Detection of Weak Magnetic Sources by SQUID Systems. [R] . Overton, W. C., van Hulsteyn, D. B., Flynn, E. R. 1989

机译：利用超导成像表面增强sQUID系统对弱磁源的检测。

Hysteresis in superconducting short weak links and μ-SQUIDs

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