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Interface-Engineered High-Tc Josephson Junctions 接口工程高tc Josephson结
Applied Superconductivity Pub Date : 1998-07-01 Epub Date: 1999-08-18 DOI: 10.1016/S0964-1807(98)00070-2
B.H Moeckly , K Char , Y Huang , K.L Merkle
{"title":"Interface-Engineered High-Tc Josephson Junctions","authors":"B.H Moeckly ,&nbsp;K Char ,&nbsp;Y Huang ,&nbsp;K.L Merkle","doi":"10.1016/S0964-1807(98)00070-2","DOIUrl":"10.1016/S0964-1807(98)00070-2","url":null,"abstract":"<div><p>We have developed a process for fabricating YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7</sub> thin-film, ramp-type edge junctions in which no deposited barrier is employed. These devices display excellent RSJ-type current–voltage (<em>I</em>–<em>V</em>) characteristics with values of <em>I</em><sub>c</sub> and <em>R</em><sub>n</sub><span> tunable over a useful range for operation of digital circuits. Initial junction reproducibility and uniformity are very encouraging.</span></p></div>","PeriodicalId":100110,"journal":{"name":"Applied Superconductivity","volume":"6 7","pages":"Pages 317-323"},"PeriodicalIF":0.0,"publicationDate":"1998-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0964-1807(98)00070-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86420991","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
A resistive d.c. SQUID noise thermometer 电阻直流SQUID噪声温度计
Applied Superconductivity Pub Date : 1998-07-01 Epub Date: 1999-08-18 DOI: 10.1016/S0964-1807(98)00109-4
S. Menkel, D. Drung , C. Aßmann , T. Schurig
{"title":"A resistive d.c. SQUID noise thermometer","authors":"S. Menkel,&nbsp;D. Drung ,&nbsp;C. Aßmann ,&nbsp;T. Schurig","doi":"10.1016/S0964-1807(98)00109-4","DOIUrl":"10.1016/S0964-1807(98)00109-4","url":null,"abstract":"<div><p><span><span>A resistive d.c. SQUID (superconducting quantum interference device), d.c. RSQUID for short, is a superconducting loop that contains two shunted Josephson junctions and a </span>resistor. Our d.c. RSQUIDs are intended for noise thermometry below 4.2</span> <span><span>K. They are fully integrated thin film devices fabricated in standard Nb technology. The resistor is made from an evaporated silver layer. It is specially designed in order to suppress the </span>proximity effect, and thus the resistor remains normally conductive down to mK temperatures.</span></p><p><span>For read-out, modified d.c. SQUID electronics are used. It is directly coupled to the d.c. RSQUID and represents a preamplifier<span> with a voltage noise of 0.8 nV/Hz</span></span><sup>1/2</sup>, a gain of 4000, and a bandwidth of 4<!--> <!-->MHz.</p><p>Due to this large bandwidth, the d.c. RSQUID can be operated at a high frequency enabling a short averaging time for the temperature measurement. At a frequency of 2<!--> <!-->MHz and a temperature of 4.2<!--> <!-->K we measured the temperature with a statistical uncertainty of 0.8% for 500<!--> <!-->s averaging time.</p></div>","PeriodicalId":100110,"journal":{"name":"Applied Superconductivity","volume":"6 7","pages":"Pages 417-422"},"PeriodicalIF":0.0,"publicationDate":"1998-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0964-1807(98)00109-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76146525","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
Memory-processor interface with hybridCMOS-RSFQ echnology 采用hybridCMOS-RSFQ技术的内存处理器接口
Applied Superconductivity Pub Date : 1998-07-01 Epub Date: 1999-08-18 DOI: 10.1016/S0964-1807(98)00077-5
Z.J Deng , H Zhang , N Yoshikawa , U Ghoshal , E Fang , A Flores , L Zheng , S.R Whiteley , T Van Duzer
{"title":"Memory-processor interface with hybridCMOS-RSFQ echnology","authors":"Z.J Deng ,&nbsp;H Zhang ,&nbsp;N Yoshikawa ,&nbsp;U Ghoshal ,&nbsp;E Fang ,&nbsp;A Flores ,&nbsp;L Zheng ,&nbsp;S.R Whiteley ,&nbsp;T Van Duzer","doi":"10.1016/S0964-1807(98)00077-5","DOIUrl":"10.1016/S0964-1807(98)00077-5","url":null,"abstract":"<div><p>The lack of high density memories at 4<!--> <!-->K has severely constrained the applications of digital Josephson electronics. Superconductor–semiconductor hybrid technology can take advantage of the high speed of a superconductor processor and the high density of a semiconductor memory and make superconducting electronics applicable. Currently we are developing a hybrid memory system to achieve low power (135 mW) and high speed (128 Gb/s) data access between a 16 GHz 8-bit superconducting rapid single flux quantum (RSFQ) vector processor and a 512 kbit complimentary metal-oxide silicon (CMOS) memory system. In this paper, we give a detailed description of both the high-level system organization and low-level circuit design, as well as simulation and test results for some circuit components of this hybrid RSFQ–CMOS memory-processor interface.</p></div>","PeriodicalId":100110,"journal":{"name":"Applied Superconductivity","volume":"6 7","pages":"Pages 355-360"},"PeriodicalIF":0.0,"publicationDate":"1998-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0964-1807(98)00077-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76604024","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Data-driven self-timed RSFQ demultiplexer 数据驱动的自定时RSFQ解复用器
Applied Superconductivity Pub Date : 1998-07-01 Epub Date: 1999-08-18 DOI: 10.1016/S0964-1807(98)00078-7
Nobuyuki Yoshikawa , Z.John Deng , Stephen R Whiteley , Theodore Van Duzer
{"title":"Data-driven self-timed RSFQ demultiplexer","authors":"Nobuyuki Yoshikawa ,&nbsp;Z.John Deng ,&nbsp;Stephen R Whiteley ,&nbsp;Theodore Van Duzer","doi":"10.1016/S0964-1807(98)00078-7","DOIUrl":"10.1016/S0964-1807(98)00078-7","url":null,"abstract":"<div><p>A superconductive rapid single flux quantum (RSFQ) demultiplexer<span> was designed, implemented and tested as an interface between high speed RSFQ circuits and low speed semiconductor circuits. We employed a data-driven self-timed (DDST) architecture to eliminate the timing constraint in the synchronous clocking. In this asynchronous architecture, a clock signal is localized within 2-bit basic demux modules, and complementary data signals are used between the modules to transmit timing information. A larger size of demux can be simply designed by connecting the 2-bit modules in a binary tree structure without any timing consideration. Successful operation has been observed in 4-bit and 8-bit systems at low frequency.</span></p></div>","PeriodicalId":100110,"journal":{"name":"Applied Superconductivity","volume":"6 7","pages":"Pages 361-365"},"PeriodicalIF":0.0,"publicationDate":"1998-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0964-1807(98)00078-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84917565","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
Energy levels quantization in Josephson junctions Josephson结的能级量子化
Applied Superconductivity Pub Date : 1998-07-01 Epub Date: 1999-08-18 DOI: 10.1016/S0964-1807(98)00082-9
P Silvestrini , B Ruggiero , C Granata , M Russo , V.G Palmieri
{"title":"Energy levels quantization in Josephson junctions","authors":"P Silvestrini ,&nbsp;B Ruggiero ,&nbsp;C Granata ,&nbsp;M Russo ,&nbsp;V.G Palmieri","doi":"10.1016/S0964-1807(98)00082-9","DOIUrl":"10.1016/S0964-1807(98)00082-9","url":null,"abstract":"<div><p><span>We have measured the switching current distributions out of the zero-voltage state of Josephson junctions in nonstationary conditions, obtained by means of fast sweeping of the current bias (≌100 kHz) resulting in a d</span><em>I</em>/d<em>t</em><span> up to 25 A/s. In this way we have analysed the effects of the levels quantization on the escape rate out of the zero voltage state in conditions where the occupancy probability of the energy levels is far from being in equilibrium.</span></p></div>","PeriodicalId":100110,"journal":{"name":"Applied Superconductivity","volume":"6 7","pages":"Pages 379-384"},"PeriodicalIF":0.0,"publicationDate":"1998-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0964-1807(98)00082-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88271027","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Integrated HTS dc-SQUID magnetometers 集成高温超导dc-SQUID磁力计
Applied Superconductivity Pub Date : 1998-07-01 Epub Date: 1999-08-18 DOI: 10.1016/S0964-1807(98)00051-9
M. Schilling
{"title":"Integrated HTS dc-SQUID magnetometers","authors":"M. Schilling","doi":"10.1016/S0964-1807(98)00051-9","DOIUrl":"10.1016/S0964-1807(98)00051-9","url":null,"abstract":"<div><p><span><span>Integrated magnetometers based on superconducting quantum interference devices (SQUIDs) are employed for the very sensitive measurement of magnetic flux and </span>magnetic flux density. Today, most superconducting magnetometers made from high-temperature superconductors (HTS) are based on YB</span><sub>a2</sub>Cu<sub>3</sub>O<sub>7</sub> and are optimized for a temperature of 77<!--> <!-->K. Depending on the application, the size of the magnetometers is restricted. Many applications in the non-destructive evaluation (NDE) of materials allow the use of large chips with up to 5<!--> <!-->cm diameter. The need for integrated, multilayer magnetometers arises, when high sensitivity has to be combined with high spatial resolution with areas below 1<!--> <!-->cm<sup>2</sup><span>. This applies to the sensors in multichannel systems for biomagnetism which have to be adapted to the size of the sources of magnetic signals in the human heart or brain. Here, a survey on the current status of integrated, thin-film YB</span><sub>a2</sub>Cu<sub>3</sub>O<sub>7</sub> magnetometers is given.</p></div>","PeriodicalId":100110,"journal":{"name":"Applied Superconductivity","volume":"6 7","pages":"Pages 291-295"},"PeriodicalIF":0.0,"publicationDate":"1998-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0964-1807(98)00051-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90977241","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Performance of quasi-optical SIS mixer with NbN/AlN/NbN tunnel junctions and NbN tuning circuit at 760 GHz 760 GHz下NbN/AlN/NbN隧道结和NbN调谐电路的准光SIS混频器性能
Applied Superconductivity Pub Date : 1998-07-01 Epub Date: 1999-08-18 DOI: 10.1016/S0964-1807(98)00120-3
Yoshinori Uzawa, Zhen Wang, Akira Kawakami
{"title":"Performance of quasi-optical SIS mixer with NbN/AlN/NbN tunnel junctions and NbN tuning circuit at 760 GHz","authors":"Yoshinori Uzawa,&nbsp;Zhen Wang,&nbsp;Akira Kawakami","doi":"10.1016/S0964-1807(98)00120-3","DOIUrl":"10.1016/S0964-1807(98)00120-3","url":null,"abstract":"<div><p><span><span>An all-NbN quasi-optical superconductor–insulator–superconductor (SIS) mixer for the </span>terahertz band has been designed and tested. This mixer consists of a MgO hyperhemispherical lens with anti-reflection cap, an NbN twin-slot antenna, and NbN tuning circuits. The size of the NbN/AlN/NbN junction was about 0.5</span> <em>μ</em>m in diameter, and the current density was about 30 kA/cm<sup>2</sup>. The junctions showed good d.c. <em>I</em>–<em>V</em><span> characteristics, with a high gap voltage of about 5.4</span> <!-->mV and a small sub-gap leakage current. The double side band (DSB) receiver noise temperature, measured by the standard Y-factor method, was about 2700<!--> <!-->K at 761 GHz. This value is much higher than the theoretical sensitivity based on the experimental <em>I</em>–<em>V</em> curve calculated using Tucker’s quantum theory of mixing. The difference between experimental and theoretical mixer performance may result from large RF losses in the tuning circuit of NbN fabricated on SiO.</p></div>","PeriodicalId":100110,"journal":{"name":"Applied Superconductivity","volume":"6 7","pages":"Pages 465-470"},"PeriodicalIF":0.0,"publicationDate":"1998-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0964-1807(98)00120-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87806785","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 12
Washer rf SQUID Magnetometers with Coplanar Resonators at 77K 77K共面谐振的Washer rf SQUID磁力计
Applied Superconductivity Pub Date : 1998-07-01 Epub Date: 1999-08-18 DOI: 10.1016/S0964-1807(98)00083-0
Y. Zhang, N. Wolters , X.H. Zeng , J. Schubert , W. Zander , H. Soltner , H.R. Yi , M. Banzet , F. Rüders , A.I. Braginski
{"title":"Washer rf SQUID Magnetometers with Coplanar Resonators at 77K","authors":"Y. Zhang,&nbsp;N. Wolters ,&nbsp;X.H. Zeng ,&nbsp;J. Schubert ,&nbsp;W. Zander ,&nbsp;H. Soltner ,&nbsp;H.R. Yi ,&nbsp;M. Banzet ,&nbsp;F. Rüders ,&nbsp;A.I. Braginski","doi":"10.1016/S0964-1807(98)00083-0","DOIUrl":"10.1016/S0964-1807(98)00083-0","url":null,"abstract":"<div><p>We have developed a novel coplanar resonator serving as a tank circuit for rf washer supercenductry quantum interference device (SQUID)s. Two coplanar lines surround flux concentrator washers. The SQUID, 2.5 or 3.5<!--> <!-->mm in diameter, is coupled to the concentrator in the flip-chip configuration. In these layouts, the adjustable resonant frequency is up to the GHz-range. With SQUID loops of 10×500<!--> <em>μ</em>m<sup>2</sup> (SQUID inductance <em>L</em><sub>s</sub>=260 pH), we measured at 77<!--> <!-->K white flux noise levels <em>S</em><sub><em>φ</em></sub><sup>1/2</sup> of 8.5 <em>μφ</em><sub>0</sub>/√Hz. This corresponded to an energy resolution ϵ of 850<!--> <!-->h and a field resolution of about 16 fT/√Hz for a concentrator diameter of 13.4<!--> <!-->mm.</p></div>","PeriodicalId":100110,"journal":{"name":"Applied Superconductivity","volume":"6 7","pages":"Pages 385-390"},"PeriodicalIF":0.0,"publicationDate":"1998-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0964-1807(98)00083-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91498431","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 30
The influence of the top and the bottom grain boundaries on the current transport in YBa2Cu3O7-δ step-edge Josephson junction YBa2Cu3O7-δ阶边Josephson结中上下晶界对电流输运的影响
Applied Superconductivity Pub Date : 1998-07-01 Epub Date: 1999-08-18 DOI: 10.1016/S0964-1807(98)00112-4
F Lombardi , Z.G Ivanov, P Komissinski , G.M Fischer , P Larsson, T Claeson
{"title":"The influence of the top and the bottom grain boundaries on the current transport in YBa2Cu3O7-δ step-edge Josephson junction","authors":"F Lombardi ,&nbsp;Z.G Ivanov,&nbsp;P Komissinski ,&nbsp;G.M Fischer ,&nbsp;P Larsson,&nbsp;T Claeson","doi":"10.1016/S0964-1807(98)00112-4","DOIUrl":"10.1016/S0964-1807(98)00112-4","url":null,"abstract":"<div><p>We have studied the electrical transport properties of the grain boundaries (GBs) formed at the top and at the bottom edges of YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-δ</sub><span> step-edge Josephson junctions, for different values of the step angle </span><em>α</em>. The step-edge junctions were fabricated on (100) LaAlO<sub>3</sub> steps using a tilted Ar ion milling. Due to the shadowing effect of the step, the middle and the bottom part of the step edge junction were contacted by thin stripes. We found that for <em>α</em>≈60° the top GB is responsible for the weak link behaviour of our step-edge junctions. On less steep steps, <em>α</em>≈45°, a series of GBs with weak link properties were found to nucleate along the step profile. We also correlated these results with the different microstructural properties of the GBs formed on steps with different angles.</p></div>","PeriodicalId":100110,"journal":{"name":"Applied Superconductivity","volume":"6 7","pages":"Pages 437-443"},"PeriodicalIF":0.0,"publicationDate":"1998-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0964-1807(98)00112-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82650501","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Picosecond response of a superconducting hot-electron NbN photodetector 超导热电子NbN光电探测器的皮秒响应
Applied Superconductivity Pub Date : 1998-07-01 Epub Date: 1999-08-18 DOI: 10.1016/S0964-1807(98)00110-0
M Lindgren , M Currie , W.-S Zeng , R Sobolewski , S Cherednichenko , B Voronov , G.N Gol'tsman
{"title":"Picosecond response of a superconducting hot-electron NbN photodetector","authors":"M Lindgren ,&nbsp;M Currie ,&nbsp;W.-S Zeng ,&nbsp;R Sobolewski ,&nbsp;S Cherednichenko ,&nbsp;B Voronov ,&nbsp;G.N Gol'tsman","doi":"10.1016/S0964-1807(98)00110-0","DOIUrl":"10.1016/S0964-1807(98)00110-0","url":null,"abstract":"<div><p>The ps optical response of ultrathin NbN photodetectors has been studied by electro-optic sampling. The detectors were fabricated by patterning ultrathin (3.5<!--> <!-->nm thick) NbN films deposited on sapphire by reactive magnetron sputtering into either a 5×10<!--> <em>μ</em>m<sup>2</sup> microbridge or 25 1<!--> <em>μ</em>m wide, 5<!--> <em>μ</em>m long strips connected in parallel. Both structures were placed at the center of a 4<!--> <!-->mm long coplanar waveguide covered with Ti/Au. The photoresponse was studied at temperatures ranging from 2.15<!--> <!-->K to 10<!--> <!-->K, with the samples biased in the resistive (switched) state and illuminated with 100 fs wide laser pulses at 395<!--> <!-->nm wavelength. At <em>T</em>=2.15<!--> <!-->K, we obtained an approximately 100 ps wide transient, which corresponds to a NbN detector response time of 45 ps. The photoresponse can be attributed to the nonequilibrium electron heating effect, where the incident radiation increases the temperature of the electron subsystem, while the phonons act as the heat sink. The high-speed response of NbN devices makes them an excellent choice for an optoelectronic interface for superconducting digital circuits, as well as mixers for the terahertz regime. The multiple-strip detector showed a linear dependence on input optical power and a responsivity <span><math><mtext>R</mtext></math></span>=3.9<!--> <!-->V/W.</p></div>","PeriodicalId":100110,"journal":{"name":"Applied Superconductivity","volume":"6 7","pages":"Pages 423-428"},"PeriodicalIF":0.0,"publicationDate":"1998-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0964-1807(98)00110-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81486997","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 10
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