Applied Superconductivity最新文献_第9页

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 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 , M Currie , W.-S Zeng , R Sobolewski , S Cherednichenko , B Voronov , G.N Gol'tsman","doi":"10.1016/S0964-1807(98)00110-0","DOIUrl":"10.1016/S0964-1807(98)00110-0","url":null,"abstract":"<div>The ps optical response of ultrathin NbN photodetectors has been studied by electro-optic sampling. The detectors were fabricated by patterning ultrathin (3.5nm thick) NbN films deposited on sapphire by reactive magnetron sputtering into either a 5×10 μm wide, 5      <!-->V/W.</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

Detection of moving fine iron particles by high-Tc SQUID 高tc SQUID检测运动的细铁颗粒

Applied Superconductivity Pub Date : 1998-07-01 DOI: 10.1016/S0964-1807(98)00066-0

T. Nagaishi, H. Toyoda , H. Kugai , H. Itozaki

引用次数: 2

A hotspot size estimate technique by using Abrikosov vortices in Josephson tunnel junctions 基于Abrikosov涡的Josephson隧道结点热点大小估计技术

Applied Superconductivity Pub Date : 1998-07-01 DOI: 10.1016/S0964-1807(98)00073-8

R. Cristiano , L. Frunzio , C.S. Pagano , V.G. Palmieri , G.P. Pepe , H. Nakagawa , M.P. Lisitskii

引用次数: 0

Interlayer Critical Current in the Vortex State of Bi2Sr2CaCu2O8+δ Intrinsic Junctions Bi2Sr2CaCu2O8+δ本征结涡旋态层间临界电流

Applied Superconductivity Pub Date : 1998-07-01 DOI: 10.1016/S0964-1807(98)00074-X

Takashi Yasuda , Tetsuji Uchiyama , Takeshi Fukami , Takafumi Aomine , Shuzo Takano

{"title":"Interlayer Critical Current in the Vortex State of Bi2Sr2CaCu2O8+δ Intrinsic Junctions","authors":"Takashi Yasuda , Tetsuji Uchiyama , Takeshi Fukami , Takafumi Aomine , Shuzo Takano","doi":"10.1016/S0964-1807(98)00074-X","DOIUrl":"10.1016/S0964-1807(98)00074-X","url":null,"abstract":"<div>We measure the current-voltage (I–V) characteristics of the Bi2Sr2CaCu2O8+δ intrinsic Josephson junctions in the magnetic field parallel to the c-axis. In the liquid phase of vortices, the I–V curve reveals three stages: ohmic relation at low currents, rapid resistive transition and a quasiparticle branch. If the maximum Josephson current Ic is defined at the transition, its field dependence is in quantitative agreement with the recent measurements on the Josephson plasma frequency ωp. This leads to the conclusion that both Ic and ωp equivalently give the information for the interlayer phase coherence. In spite of the finite Josephson current, there appears Lorentz-force-independent dissipation at small currents, indicating that the interlayer critical current is zero in the liquid phase. We discuss the applicability of the phase-slip mechanism associated with the in-plane motion of the vortex pancakes.</div>","PeriodicalId":100110,"journal":{"name":"Applied Superconductivity","volume":"6 7","pages":"Pages 337-342"},"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)00074-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82506554","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

Transient dynamics of Josephson-coupled multilayers josephson耦合多层材料的瞬态动力学

Applied Superconductivity Pub Date : 1998-07-01 DOI: 10.1016/S0964-1807(98)00050-7

Susanne Lomatch , Edward D. Rippert

引用次数: 1

Characteristics of intrinsic tunnel junctions on Bi-2223 thin films Bi-2223薄膜上本征隧道结的特性

Applied Superconductivity Pub Date : 1998-07-01 DOI: 10.1016/S0964-1807(98)00075-1

A. Odagawa, M. Sakai , H. Adachi , K. Setsune

引用次数: 0

Coulomb blockade electrometer based on single Cooper pair tunneling 基于单库珀对隧穿的库仑阻断静电计

Applied Superconductivity Pub Date : 1998-07-01 DOI: 10.1016/S0964-1807(98)00116-1

A.B. Zorin , Yu.A. Pashkin , V.A. Krupenin , H. Scherer

{"title":"Coulomb blockade electrometer based on single Cooper pair tunneling","authors":"A.B. Zorin , Yu.A. Pashkin , V.A. Krupenin , H. Scherer","doi":"10.1016/S0964-1807(98)00116-1","DOIUrl":"10.1016/S0964-1807(98)00116-1","url":null,"abstract":"<div>We have studied the electrometric characteristics of the Bloch transistor, i.e. the structure comprising a double small-capacitance superconductor junction (where both the Josephson and the charging energies, EJ1,2∽EC1,2≫kBT) and an adjacent gate electrode polarizing its island. The transistor bias is realized through small-sized high-ohmic resistors (≫RQ=h/4e2≈6.5 kΩ) to ensure a high electromagnetic impedance of the transistor environment. At low bias current, a coherent flow of single Cooper pairs occurs and the average voltage across the transistor shows a 2e-periodic dependence on the polarization charge Q0. The sensitivity of such an electrometer has been evaluated and found to be comparable to that of the single-electron counterpart. The device has been fabricated with Al/AlOx/Al junctions and two miniature on-chip Cr resistors (each of 80 kΩ and 10 <!-->Hz.</div>","PeriodicalId":100110,"journal":{"name":"Applied Superconductivity","volume":"6 7","pages":"Pages 453-458"},"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)00116-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83284745","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

Progress towards a hand portable pulse tube refrigerator for high Tc dc SQUID operation 用于高Tc直流SQUID操作的手持式便携式脉管制冷机的进展

Applied Superconductivity Pub Date : 1998-07-01 DOI: 10.1016/S0964-1807(98)00117-3

C Dolabdjian , S Saez , D Bloyet , M David , J.C Maréchal

引用次数: 3

Development of needle-shaped grains from Bi2Sr2CaCu2O8+x with high critical current density suitable for making superconducting wires 以Bi2Sr2CaCu2O8+x为原料制备适合超导导线的高临界电流密度针状晶粒

Applied Superconductivity Pub Date : 1998-06-01 DOI: 10.1016/S0964-1807(98)00054-4

O. Cabeza, O. Barca, F. Miguélez

{"title":"Development of needle-shaped grains from Bi2Sr2CaCu2O8+x with high critical current density suitable for making superconducting wires","authors":"O. Cabeza, O. Barca, F. Miguélez","doi":"10.1016/S0964-1807(98)00054-4","DOIUrl":"10.1016/S0964-1807(98)00054-4","url":null,"abstract":"<div>We present a grain microstructure for Bi(2212) consisting of only giant needle-shaped grains of around 1.5mm length and 100  K and in absence of applied magnetic field, a value comparable with that presented for the best wires and thick films. Not only are the shape and the size of these grains very suitable for making superconducting wires, but also the superconducting properties, Tc and Jc, are both high enough to be confident about the possibility of improving the actual Bi(2212) superconducting wires for high current applications.</div>","PeriodicalId":100110,"journal":{"name":"Applied Superconductivity","volume":"6 6","pages":"Pages 267-278"},"PeriodicalIF":0.0,"publicationDate":"1998-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0964-1807(98)00054-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83149030","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

New design concept of the magnet system generating the high pulsed field in combination with the bias field of the superconducting magnet 结合超导磁体的偏置场产生高脉冲场的磁体系统的新设计理念

Applied Superconductivity Pub Date : 1998-06-01 DOI: 10.1016/S0964-1807(98)00115-X

J. Pitel , H. Jones

{"title":"New design concept of the magnet system generating the high pulsed field in combination with the bias field of the superconducting magnet","authors":"J. Pitel , H. Jones","doi":"10.1016/S0964-1807(98)00115-X","DOIUrl":"10.1016/S0964-1807(98)00115-X","url":null,"abstract":"<div>A new design concept of the axisymmetric magnet system generating the very high pulsed magnetic field which is superimposed on the bias magnetic field of the superconducting magnet is presented. The pulsed magnet consists of two coaxial coils which are wound in opposite directions. The geometry of both pulsed coils, i.e. the working (inner) one and the compensating (outer) one is designed in such a way that the mutual coupling between the small pulsed magnet and the outer superconducting magnet is practically zero. This configuration prevents the rise of the high induced voltage on the current leads of the superconducting magnet when the pulsed magnet is being energised, hence resulting naturally in protection of the system (superconducting magnet and the current source) against possible damage. Further, it is predicted that the stray field of the pulsed magnet, which gives rise e.g. to the eddy currents in the winding of the superconducting magnet, is considerably decreased. The simple theory enabling the design of the geometry of the compensating pulsed coil is derived. The advantages of this new concept are demonstrated on the results of the theoretical analysis using, as an example, one of the pulsed coils that were designed and fabricated in the Clarendon Laboratory, in connection with the Oxford Instrument superconducting magnet (Clarendon hybrid outer) which can generate a steady magnetic field up to 10  <!-->mm.</div>","PeriodicalId":100110,"journal":{"name":"Applied Superconductivity","volume":"6 6","pages":"Pages 247-257"},"PeriodicalIF":0.0,"publicationDate":"1998-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0964-1807(98)00115-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78913271","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