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Current-voltage characteristics of voltage-biased Tl_2Ba_2CaCu_2O_8 intrinsic Josephson junctions

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Science China(Physics,Mechanics & Astronomy) 2014年第12期57卷 2242-2245页

作者： WANG Pei XIE Wei HU Lei LIU Xin JI Lu HE Ming ZHANG Xu ZHAO XinJie yan shaolin Department of Electronics Nankai University

The voltage-biased current-voltage （I-V） characteristics of intrinsic Josephson junctions （IJJs）, which are fabricated with misa- ligned high temperature superconducting Tl2Ba2CaCu2O8 （T1-2212） thin film, are investigated experimentally. Three charac- teristic regions in the I-V curve are observed at 47 K. In the low voltage part, the current firstly increases and then decreases slowly with increasing the biased voltage, which is shown as a bump. In the next region, the current slightly increases with in- creasing the biased voltage until a sudden decrease of the current appears. Thereafter, branch structure forms with increasing the voltage on the I-V characteristic. The influence of the self-heating on the I-V characteristics is investigated and the temper- ature dependence of the I-V characteristics is measured to explore these characteristics in detail.

关键词： intrinsic Josephson junctions voltage-biased I-V characteristics

A TlBaCaCuO Thin Film Planar dc-Squid Magnetometer

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Chinese Physics Letters 1993年第3期10卷 132-134页

作者： CHEN Lie ZHANG Lihua WENG Yaojun yanG Tao LIU Dong SHAO Kai yan shaolin Institute of Physics Academia SinicaBeijing 100080 also Department of Physics Northwest UniversityXi’an 710069 Nanjing Electronic Devices institute Nanjing 210026 Department of Electronic Nankai UniversityTianjin 300071

A superconducting quantum interference device(squid)was made from TlBa-CaCuO(TBCCO)thin *** squid loop forms a part of the pickup *** squid hole is a square of about 100x100μ*** pickup loop and the squid loop inductances are estimated to be 11 nH and 190pH,*** best value of equivalent flux noise as measured in the flux locked loop mode is 4×10^(-4)Ф_(0)/Hz^(1/2) at dc-1 *** corresponding sensitivity resolution at this frequency is 9pT/Hz^(1/2),about a factor 8 higher than the squid loop area.

关键词： mode locked loop

X-ray Photoelectron Spectroscopy on Superconducting T_(12)CaBa_(2)Cu_(2)O_(8) Thin Film

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Chinese Physics Letters 1991年第6期8卷 314-317页

作者： ZENG Wensheng QIU ping yan shaolin LI Zengfa ZHANG Guangyin Department of Physics Nankai UniversityTianjin 300071 Department of Chemistry Nankai UniversityTianjin 300071 Department of Electric Science Nankai UniversityTianjin 300071

We have prepared single-phase superconducting T_(12)CaBa_(2)Cu_(2)O_(8) thin film by dc magnetron sputtering process and measured X-ray photoelectron spectra of the film at room and liquid nitrogen *** the relative intensities of the Ba3d,Tl4f.O1 s and Cu2p spectra taken at different take-off angles,we have concluded that there is an adventitious contamination(nonsupercon-ducting phase)surface *** excluding contributions from these spurious phases,we have tentatively assigned which core-level shifts should be caused by the superconducting phase transition.

关键词： transition CaBa film

Development of high-temperature superconducting filters operating at temperatures above 90 K

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Chinese Science Bulletin 2009年第19期54卷 3596-3599页

作者： XIA HouHai ZHOU ChunXia ZUO Tao HE Ming JI Lu ZHOU TieGe ZHAO XinJie FANG Lan yan shaolin Deptartment of Electronics Nankai University Tianjin 300071 China

This paper represents the development of a high temperature superconducting (HTS) filter, the highest operating temperature of which is up to 93 K. The filter is designed for S band with 4% fractional bandwidth and fabricated using thallium-barium-calcium-copper oxide (Tl2Ba2CaCu2O8) thin films. At 93 K, the measurements of the filter show that the insertion loss in the passband is less than 0.22 dB, the return loss is better than 20 dB, and the out-of-band rejection is more than 80 dB. The analysis on the characteristics of the filter operating at different temperatures shows that the filter can work well at temperatures around 90 K. The temperature of 93 K is the highest among the previous reports for HTS filters. The result reported in this paper is significant for HTS filters to be used in the field of microwave communication requiring high sensitivity.

关键词： HTS 低温物理学进展研究发展

Development of cryogenically-cooled low noise amplifier for mobile base station receivers

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Chinese Science Bulletin 2011年第35期56卷 3884-3887页

作者： ZHANG Xu LIU Jia CHEN ChuangYe LIU Wei LIU JingBin LI BaoHui HE Ming ZHOU TieGe ZHAO XinJie yan shaolin FANG Lan School of Physics Nankai University Tianjin 300071 China College of Information Technical Science Nankai University Tianjin 300071 China

A new circuit model for designing and manufacturing an S-band low noise amplifier(LNA) with the software,Advanced Design System(ADS),is introduced in this *** proposed model involves shunted impedance at the grid to achieve a stable LNA without measuring the S-parameters of transistors at low *** LNA was measured over the operation band of 2.2-2.3 GHz,which has input and output standing wave ratios below *** noise figure of the manufactured LNA was about 0.2 dB and the gain was above 22 dB,which indicated that our LNA worked well at 77 K.

关键词：低噪声放大器低温冷却基站接收机移动电路模型设计系统 LNA 工作频段

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用阳离子置换法制备汞系高温超导薄膜

南开大学学报（自然科学版） 1999年第3期32卷 83-87页

作者：方兰阎少林南开大学电子科学系天津300071

介绍了最近发明的一种制备汞系高温超导薄膜的新方法—阳离子置换法．采用Ｔ１系外延超导薄膜作为先驱薄膜，将Ｔ１系超导薄膜在Ｈｇ气氛下进行热处理，用Ｈｇ置换先驱薄膜中的Ｔ１，进而生成Ｈｇ系外延超导薄膜．用此方法，成功... 详细信息

介绍了最近发明的一种制备汞系高温超导薄膜的新方法—阳离子置换法．采用Ｔ１系外延超导薄膜作为先驱薄膜，将Ｔ１系超导薄膜在Ｈｇ气氛下进行热处理，用Ｈｇ置换先驱薄膜中的Ｔ１，进而生成Ｈｇ系外延超导薄膜．用此方法，成功地在ＬａＡｌＯ３（００１）衬底上制做出了高质量的ＨｇＢａ２ＣａＣｕ２Ｏｘ超导薄膜．Ｘ－光衍射θ－２θ扫描和极图测试表明，薄膜具有很纯的超导相和很好的外延结构．超导临界温度可达１２２Ｋ．在７７Ｋ温度下，临界电流密度达到３．４×１０６Ａ／ｃｍ２，在１１０Ｋ温度下，临界电流密度仍可保持在０．７×１０６Ａ／ｃｍ２．

关键词：汞系高温超导薄膜阳离子置换超导临界温度