Applied Superconductivity最新文献_第4页

A current mirror based on single electron devices 基于单电子器件的电流反射镜

Applied Superconductivity Pub Date : 1999-10-01 Epub Date: 2000-03-01 DOI: 10.1016/S0964-1807(99)00043-5

P. Delsing, D.B. Haviland

引用次数: 4

Electromigration study of SNS ramp edge Josephson junctions SNS斜坡边Josephson结的电迁移研究

Applied Superconductivity Pub Date : 1999-10-01 Epub Date: 2000-03-01 DOI: 10.1016/S0964-1807(99)00005-8

J.P Sydow , D Chamberlain , R.A Buhrman , K Char , B.H Moeckly

引用次数: 5

Optically-induced effects in Y–ba–cu–O Josephson junctions Y-ba-cu-O Josephson结的光诱导效应

Applied Superconductivity Pub Date : 1999-10-01 Epub Date: 2000-03-01 DOI: 10.1016/S0964-1807(99)00039-3

Roman Adam , Roman Sobolewski , Wilhelm Markowitsch , Christian Stockinger , Wolfgang Lang

{"title":"Optically-induced effects in Y–ba–cu–O Josephson junctions","authors":"Roman Adam , Roman Sobolewski , Wilhelm Markowitsch , Christian Stockinger , Wolfgang Lang","doi":"10.1016/S0964-1807(99)00039-3","DOIUrl":"10.1016/S0964-1807(99)00039-3","url":null,"abstract":"<div>We report our studies on light-induced changes in electrical properties of YBa2Cu3Ox (YBCO) grain-boundary Josephson weak links. We discuss the erasable process (photodoping), in which light-induced enhancement of junctions properties at low temperatures relaxes back above 250K. Our studies are focused on the junction critical current versus time, light intensity, and magnetic field measurements. In tested few-μm-wide step-edge junctions, photodoping manifested itself as above 50% increase of the critical current and the decrease of the junction magnetic penetration depth, leading to reduction of the effective junction width. Contrary to the photodoping effect, the high-intensity laser modification of junctions led to permanent modification of their electrical characteristics that remained unchanged after subsequent room-temperature/helium thermal cycling of the sample. The laser-modified junctions exhibited up to 25% increase of the critical current times normal-state resistance product.</div>","PeriodicalId":100110,"journal":{"name":"Applied Superconductivity","volume":"6 10","pages":"Pages 759-765"},"PeriodicalIF":0.0,"publicationDate":"1999-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0964-1807(99)00039-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73029840","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: 1

Bit error rate experiments in ring-shaped RSFQ circuits 环形RSFQ电路误码率实验

Applied Superconductivity Pub Date : 1999-10-01 Epub Date: 2000-03-01 DOI: 10.1016/S0964-1807(99)00034-4

M.I. Khabipov , W. Kessel, F.-Im. Buchholz, R. Dolata, J. Niemeyer

引用次数: 6

Investigation of basic elements and devices in multilayer technology for HTS digital RSFQ circuits HTS数字RSFQ电路多层技术的基本元件和器件研究

Applied Superconductivity Pub Date : 1999-10-01 Epub Date: 2000-03-01 DOI: 10.1016/S0964-1807(99)00031-9

B. Ruck, Y. Chong, G. Wahl, R. Dittmann, C. Horstmann, A. Engelhardt, B. Oelze, E. Sodtke

{"title":"Investigation of basic elements and devices in multilayer technology for HTS digital RSFQ circuits","authors":"B. Ruck, Y. Chong, G. Wahl, R. Dittmann, C. Horstmann, A. Engelhardt, B. Oelze, E. Sodtke","doi":"10.1016/S0964-1807(99)00031-9","DOIUrl":"10.1016/S0964-1807(99)00031-9","url":null,"abstract":"<div>Complex high temperature superconductor digital RSFQ circuits require a multilayer technology that is compatible with freely positionable Josephson junctions. For RSFQ circuits, especially small inductances are required. This can be achieved by using superconducting striplines on a YBCO groundplane. We have produced and examined all basic elements like, e.g., superconducting cross-overs, vias, pinhole free insulation layers and on-chip resistors that are necessary to design and fabricate HTS RSFQ circuits. All structures have been successfully tested and integrated with ramp type junctions with PBCO barriers. For the superconducting lines over the groundplane an inductance of 0.8 pH/square was measured which shows the advantage of a superconducting groundplane. Based on this technology we fabricated a simple multilayer circuit consisting of two magnetically coupled d.c.-SQUIDs. Here we used bicrystal junction stacks due to the smaller spread of junction parameters. The circuit allowed essential operations like generating, erasing and detecting a single flux quantum. One d.c.-SQUID served as storage loop while the other was kept permanently in the voltage state and was used to determine the internal flux state of the storage loop.</div>","PeriodicalId":100110,"journal":{"name":"Applied Superconductivity","volume":"6 10","pages":"Pages 699-704"},"PeriodicalIF":0.0,"publicationDate":"1999-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0964-1807(99)00031-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78504940","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

Tunneling spectroscopy of high-Tc superconductors 高温超导体的隧穿光谱

Applied Superconductivity Pub Date : 1999-10-01 Epub Date: 2000-03-01 DOI: 10.1016/S0964-1807(99)00042-3

L Alff , A Marx , R Gross , A Beck , H Takashima , S Kashiwaya , M Koyanagi , Y Tanaka

{"title":"Tunneling spectroscopy of high-Tc superconductors","authors":"L Alff , A Marx , R Gross , A Beck , H Takashima , S Kashiwaya , M Koyanagi , Y Tanaka","doi":"10.1016/S0964-1807(99)00042-3","DOIUrl":"10.1016/S0964-1807(99)00042-3","url":null,"abstract":"<div>We have performed tunneling spectroscopy experiments on different kinds of high-temperature superconductors (HTS) and different types of junctions. Firstly, spectra were taken on surfaces of YBa2Cu3O7-δ (YBCO) thin films and Nd1.85Ce0.15CuO4-y (NCCO) single crystals by low-temperature scanning tunneling microscopy/spectroscopy (LTSTM/S) in a superconductor-insulator-normal metal (SIN) configuration. Second, the tunneling spectra of grain-boundary junctions (GBJs) fabricated on bicrystal substrates were measured for the materials YBCO, La1.85Sr0.15CuO4-δ (LSCO), Bi2Sr2CaCu2O8+δ (BSCCO) and NCCO in a SIS configuration. The characteristics of the spectra in both systems could be related to the symmetry of the order parameter in the superconducting electrode(s). In particular, a zero bias conductance peak (ZBCP) was observed only in systems with a d-wave symmetry, but was completely absent in the s-wave system NCCO.</div>","PeriodicalId":100110,"journal":{"name":"Applied Superconductivity","volume":"6 10","pages":"Pages 783-787"},"PeriodicalIF":0.0,"publicationDate":"1999-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0964-1807(99)00042-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84111969","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

Ultralow temperature NMR detection using dc SQUIDs 使用直流squid进行超低温核磁共振检测

Applied Superconductivity Pub Date : 1999-10-01 Epub Date: 2000-03-01 DOI: 10.1016/S0964-1807(99)00038-1

S.L. Thomasson , C.M. Gould

引用次数: 3

Noise and mixing properties of high-Tc Josephson junctions at W-band frequencies w波段高tc约瑟夫森结的噪声和混频特性

Applied Superconductivity Pub Date : 1999-10-01 Epub Date: 2000-03-01 DOI: 10.1016/S0964-1807(99)00030-7

O. Harnack , M. Darula , H. Andoh , S. Beuven , H. Kohlstedt

{"title":"Noise and mixing properties of high-Tc Josephson junctions at W-band frequencies","authors":"O. Harnack , M. Darula , H. Andoh , S. Beuven , H. Kohlstedt","doi":"10.1016/S0964-1807(99)00030-7","DOIUrl":"10.1016/S0964-1807(99)00030-7","url":null,"abstract":"<div>We report on the noise and Josephson mixing properties of high-Tc superconductor (HTS) Josephson junctions. Direct radiation measurements and heterodyne mixing experiments in the frequency range 45–141 GHz have been performed by using YBa2Cu3O7−x (YBCO) step-edge junctions (SEJ) on LaAlO3 and MgO and bicrystal junctions (BCJ) on MgO substrates. Junctions with current voltage characteristics (CVC) close to predictions of the resistivity shunted junction (RSJ) model were mounted into a high sensitive radiometer system. From linewidth measurements we calculated an effective noise temperature of our junctions. In heterodyne mixing experiments we obtained conversion efficiencies around −14 dB in the 11 GHz intermediate frequency (IF) band under the radiation of two monochromatic signals. In the fundamental mixing regime we observed response at IF at working temperatures up to 72 K. The measured receiver and mixer noise temperature of the Josephson mixer at 94 GHz local oscillator (LO) frequency, an IF of 1.4 GHz and at a working temperature of 10  <!-->K, respectively.</div>","PeriodicalId":100110,"journal":{"name":"Applied Superconductivity","volume":"6 10","pages":"Pages 689-697"},"PeriodicalIF":0.0,"publicationDate":"1999-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0964-1807(99)00030-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84252456","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

Real-time measurements on a four stage RSFQ-counter with Nb–Al2O3–Nb Josephson junctions 实时测量的四级rsfq计数器与Nb-Al2O3-Nb约瑟夫森结

Applied Superconductivity Pub Date : 1999-10-01 Epub Date: 2000-03-01 DOI: 10.1016/S0964-1807(99)00011-3

W. Benzing, M. Biehl, E. Crocoll, R. Koch, M. Neuhaus, T. Scherer, W. Jutzi

引用次数: 1

Index 指数

Applied Superconductivity Pub Date : 1999-10-01 Epub Date: 2000-03-01 DOI: 10.1016/S0964-1807(99)00055-1

引用次数: 0