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毫欧姆级电阻测量电路设计 被引量:9
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作者 赵少波 《仪器仪表学报》 EI CAS CSCD 北大核心 2001年第z1期136-138,共3页
本文介绍了一种直接测量毫欧姆级电阻的方法 ,相对于比较法更快速精确。设计了一个高精密大电流恒流源。消除了测试过程中存在的随机接触误差的影响。
关键词 测量 毫欧姆 接触电阻 机体电阻 恒流源
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Titanium doped kagome superconductor CsV_(3-x)Ti_(x)Sb_(5)and two distinct phases 被引量:3
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作者 Haitao Yang Zihao Huang +22 位作者 Yuhang Zhang Zhen Zhao Jinan Shi Hailan Luo Lin Zhao Guojian Qian Hengxin Tan Bin Hu Ke Zhu Zouyouwei Lu Hua Zhang Jianping Sun Jinguang Cheng Chengmin Shen Xiao Lin Binghai Yan Xingjiang Zhou Ziqiang Wang Stephen J.Pennycook Hui Chen Xiaoli Dong Wu Zhou Hong-Jun Gao 《Science Bulletin》 SCIE EI CAS CSCD 2022年第21期2176-2185,共10页
The vanadium-based kagome superconductor CsV_(3)Sb_(5) has attracted tremendous attention due to its unexcepted anomalous Hall effect(AHE),charge density waves(CDWs),nematicity,and a pseudogap pair density wave(PDW)co... The vanadium-based kagome superconductor CsV_(3)Sb_(5) has attracted tremendous attention due to its unexcepted anomalous Hall effect(AHE),charge density waves(CDWs),nematicity,and a pseudogap pair density wave(PDW)coexisting with unconventional strong-coupling superconductivity.The origins of CDWs,unconventional superconductivity,and their correlation with different electronic states in this kagome system are of great significance,but so far,are still under debate.Chemical doping in the kagome layer provides one of the most direct ways to reveal the intrinsic physics,but remains unexplored.Here,we report,for the first time,the synthesis of Ti-substituted CsV_(3)Sb_(5) single crystals and its rich phase diagram mapping the evolution of intertwining electronic states.The Ti atoms directly substitute for V in the kagome layers.CsV_(3-x)Ti_(x)Sb_(5) shows two distinct superconductivity phases upon substitution.The Ti slightly-substituted phase displays an unconventional V-shaped superconductivity gap,coexisting with weakening CDW,PDW,AHE,and nematicity.The Ti highly-substituted phase has a U-shaped superconductivity gap concomitant with a short-range rotation symmetry breaking CDW,while long-range CDW,twofold symmetry of in-plane resistivity,AHE,and PDW are absent.Furthermore,we also demonstrate the chemical substitution of V atoms with other elements such as Cr and Nb,showing a different modulation on the superconductivity phases and CDWs.These findings open up a way to synthesise a new family of doped CsV_(3)Sb_(5) materials,and further represent a new platform for tuning the different correlated electronic states and superconducting pairing in kagome superconductors. 展开更多
关键词 Kagome superconductor Chemical doping Charge density waves Nematicity Competing orders
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A carbon monoxide sensor based on single-walled carbon nanotubes doped with copper chloride 被引量:1
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作者 ZHANG GuangDi TAI HuiLing +2 位作者 XIE GuangZhong JIANG YaDong ZHOU Yong 《Science China(Technological Sciences)》 SCIE EI CAS 2013年第10期2576-2580,共5页
A carbon monoxide gas sensor based on single-walled carbon nanotube (SWCNT) has been developed for detection of carbon monoxide (CO) at room temperature. Copper chloride (CuC1) was mixed with SWNT by mechanical ... A carbon monoxide gas sensor based on single-walled carbon nanotube (SWCNT) has been developed for detection of carbon monoxide (CO) at room temperature. Copper chloride (CuC1) was mixed with SWNT by mechanical blending. The thin film was deposited on interdigitated electrodes by using airbrush technology. This paper described the fabrication of the sensor for detecting carbon monoxide with concentrations from 20 ppm to 100 ppm. The performance of CO gas sensor was measured by using relevant apparatus to obtain the continuous sensor electric resistance change on exposure to CO and air atmosphere at room temperature, respectively. The results exhibited that the senor presented a larger sensitivity and a good recoverability. The experimental results suggested the potential use of CuC1 doped SWCNT for CO detecting. 展开更多
关键词 carbon monoxide gas sensor single-walled carbon nanotubes copper chloride room temperature
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