IEEE Transactions on Applied Superconductivity
Issue 1 Part 1 • March-2001
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The 2000 Applied Superconductivity Conference
Publication Year: 2001,Page(s):c3 - c29
Cited by: Papers (2)
The 2000 Applied Superconductivity Conference
Year: 2001 | Volume: 11 | Issue: 1
Superconductivity: star technology for the 21st century
Publication Year: 2001,Page(s):39 - 48
Cited by: Papers (5)
The author reviews the history of superconductivity. He considers the breakthrough of low temperature superconductors; the progress of high temperature superconductors; the environmental needs of superconductivity and finally the assessment and challenges of future superconducting technology.Show More
Magnetocardiography (MCG), the magnetic equivalent to electrocardiography (ECG), is one of the most promising major applications of SQUID systems. Recent advances in SQUID-system technology such as improved noise suppression techniques, better field sensitivity (in particular for HTS SQUIDs), real time options, vector magnetometers and novel signal analysis approaches have appreciably reduced the ...Show More
After many years of research and development, HTS filter subsystems for telecommunications are finally being manufactured in volume. Nearly 1,000 HTS filter subsystems are currently deployed worldwide with millions of hours of cumulative operation. An overview of the worldwide effort to commercialize HTS filter subsystems is presented. The essential technology elements required to manufacture HTS ...Show More
NbN multilayer technology on R-plane sapphire
J.-C. Villegirr;N. Hadacek;S. Monso;B. Delnet;A. Roussy;P. Febvre;G. Lamura;J.-Y. Laval
Publication Year: 2001,Page(s):68 - 71
A new NbN multilayer technology has been developed on 3 inch diameter R-plane sapphire substrates, for combining on-chip fast RSFQ circuits with GHz bandwidth optical links, The circuits take advantage of two high quality [110] NbN layers sputtered epitaxially on sapphire at 600/spl deg/C and selectively patterned: a 400 nm thick layer (/spl lambda//sub L//spl sim/250 nm at 6 K) acts for the groun...Show More
Overdamped NbN junctions with Nb/AlO/sub x//Nb multilayered barriers
H. Akaike;T. Iwai;Y. Ninomiya;K. Nakamura;A. Fujimaki;H. Hayakawa
Publication Year: 2001,Page(s):72 - 75
Cited by: Papers (5)
This paper describes electrical characteristics of NbN junctions with Nb/Al/sub 2/O/sub 3/-Al/(Nb) multilayered barriers. The junctions show overdamped behavior at 10 K because of Nb working as a normal layer, which enables us to use them as basic elements in single flux quantum (SFQ) circuits. The junctions, with critical current densities J/sub c/'s up to 3.4 kA/cm/sup 2/ and characteristic volt...Show More
Fabrication of Nb/Al-N/sub x//NbTiN junctions for SIS mixer applications
Publication Year: 2001,Page(s):76 - 79
We discuss fabrication and characteristics of superconductor-insulator-superconductor (SIS) junctions which typically exhibit a 3.5 mV sum-gap voltage. Junctions have a sub-gap to normal state resistance ratio of R/sub SG//R/sub N/=27 for resistance-area products down to R/sub N/A=8 /spl Omega/ /spl mu/m/sup 2/ and high quality junctions have been produced with RNA products as low as 4 /spl Omega/...Show More
Low-loss epitaxial NbN/MgO/NbN trilayers for THz applications
Publication Year: 2001,Page(s):80 - 83
Cited by: Papers (26)
To improve the performance of Josephson oscillators and SIS mixers over 700 GHz, we have developed a fabrication process to grow epitaxial NbN/MgO/NbN trilayers by reactive dc-sputtering. Trilayers were fabricated on a single-crystal MgO substrate at ambient temperature. NbN and MgO films were deposited by reactive dc-sputtering with an Nb and Mg target, respectively. The MgO inter-layer thickness...Show More
1/f noise in high current density NbN/AlN/NbN tunnel junctions
Publication Year: 2001,Page(s):84 - 87
Low frequency noise characteristics of epitaxial NbN/AlN/NbN tunnel junctions have been investigated. For all of our junctions with different current densities, the voltage noise power spectrum S/sub v/(f) showed a frequency dependence of 1/f type. The magnitude of the S/sub v/(f) exhibited two distinct types of dependency on the current density and AlN barrier thickness. We consider that this may...Show More
NbN/TaN/sub x//NbN SNS Josephson junctions by pulsed laser deposition
Publication Year: 2001,Page(s):88 - 91
Cited by: Papers (11)
We have made NbN/TaN/sub x//NbN Josephson junctions with nonhysteretic I-V characteristics that may have potential application for single-flux-quantum logic or SQUID magnetometers. The trilayer growth was done in-situ using pulsed laser deposition. The resistivity of the TaN/sub x/ was varied by the N/sub 2/ pressure during growth from a few hundred micro-ohm-cm at low pressure to a few hundred mi...Show More
NbN/TaN/sub x//NbN SNS Josephson junctions by pulsed laser deposition
Year: 2001 | Volume: 11 | Issue: 1
Use of a focused ion beam for characterizing SIS circuits
Publication Year: 2001,Page(s):92 - 94
Cited by: Papers (3)
We have found the use of a Ga/sup +/ based focused ion beam (FIB) system to be very useful in characterizing our superconducting-insulating-superconductor (SIS) fabrication process. This tool enables us to physically carve cross sections in any feature of interest on our wafer which we can then image with an SEM. This process is used to examine and monitor improvements in the coverage of metalliza...Show More
A reliable procedure based on the niobium technology has been developed to fabricate low intrinsic noise Josephson devices. Results concerning both the design and the characterization of fully integrated DC-SQUID magnetometers are reported. Such devices well meet the requirements of multichannel systems for biomagnetic measurements.Show More
Resonances and flux-flow in Josephson junctions
Publication Year: 2001,Page(s):99 - 102
Cited by: Papers (5)
We have studied flux-flow in very long inline Josephson junctions by experiments and numerical simulations. The existence of the phenomenon is evident through the appearance of resistive branches in the current-voltage characteristics. The results are found in very good agreement with the numerical simulations performed on the basis of real experimental parameters. We demonstrate the fundamental d...Show More
Superconducting slot antenna with broadband impedance matching circuit
Publication Year: 2001,Page(s):103 - 106
Cited by: Papers (34)
A superconducting slot antenna with broadband impedance matching circuit has been proposed and studied theoretically. In order to solve the problem of narrow bandwidths peculiar to superconducting small antennas, which originates from the small antenna impedance, we propose a new design theory of the broadband impedance matching circuit for the antenna. Using the theory we designed a three stage i...Show More
Broadband HTS microstrip antennas for satellite communication
Publication Year: 2001,Page(s):107 - 110
Cited by: Papers (10)
The major limitation of high-T/sub c/ superconducting (HTS) microstrip antennas is the narrow bandwidth due to the high Q and thin substrate. Defining bandwidth as the frequency range over which standing wave ratio (SWR) 2:1 or less, HTS antenna bandwidths are typically 0.85% to 1.1%. Thus considerable effort has been focused on developing antennas for broadband operation. In this work the HTS ant...Show More
Miniaturized cooling systems for HTS antennas
K. Ehata;K. Sato;M. Kusunoki;M. Mukaida;S. Ohshima;Y. Suzuki;K. Kanao
Publication Year: 2001,Page(s):111 - 114
Cited by: Papers (5)
Two types of miniaturized cooling systems for High-Temperature Superconducting (HTS) antennas were designed and built. In this paper, details of these systems, measured and simulated properties of patch antennas installed in these systems, and results of a seal-off trial for 1 month are reported. Both the systems had portable size and weight and could cool the HTS devices. When a patch antenna wit...Show More
Miniaturized cooling systems for HTS antennas
K. Ehata;K. Sato;M. Kusunoki;M. Mukaida;S. Ohshima;Y. Suzuki;K. Kanao
Year: 2001 | Volume: 11 | Issue: 1
Normal and superconductor coplanar waveguides with 100 nm line width
S. Wuensch;G. Benz;E. Crocoll;M. Fitsilis;M. Neuhaus;T.A. Scherer;W. Jutzi
Publication Year: 2001,Page(s):115 - 118
Cited by: Papers (6)
High speed high package density integrated circuits require a hierarchy of interconnections with small and large cross sections where the smallest linewidth approaches the 100 nm range. Attenuation and delay of superconducting interconnections down to the order of the London penetration depth for 50 /spl Omega/ and higher characteristic impedances are compared with normal conducting ones near 20 G...Show More
Characterization of X-band filter of double-sided Y-Ba-Cu-O film on MgO substrate
Publication Year: 2001,Page(s):119 - 122
Cited by: Papers (2)
We investigated the pulsed laser deposition process of double-sided Y-Ba-Cu-O thin films on MgO substrates, the critical current density (Jc) distribution and the microwave surface impedance (Rs) of the films, and the power handling capability by third-order intermodulation distortion (IMD3) measurements using 40 W high power microwave measurement system. A clean flat MgO surface was important for...Show More
Local microwave surface resistance variations of the YBaCuO thin films patterned by selective laser irradiation and plasma fluorination
Y.J. Feng;L. Liu;Z.L. Fu;L.Y. Wu;Q.G. Liu;L.X. You;L. Kang;S.Z. Yang;P.H. Wu;S.Z. Wang
Publication Year: 2001,Page(s):123 - 126
Cited by: Papers (1)
In this paper, we have studied the planar patterning of the YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// thin films by laser irradiation and ion plasma treatment. The laser ablated YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// thin films have been modified either by selective laser irradiation or by plasma fluorination in an atmosphere of CF/sub 4/ to pattern microwave devices. Transport measurements and mic...Show More
Electrical and thermal modulation of the propagation time in superconducting spiral lines by optoelectronic techniques
Publication Year: 2001,Page(s):127 - 130
Cited by: Papers (1)
Current and temperature controlled delays in the propagation time of electrical pulses in YBa/sub 2/Cu/sub 3/O/sub 7-x/ (YBCO) spiral transmission lines have been investigated by using optoelectronic techniques. The transmission lines are configured in a stripline geometry, where the central strip consists of a thin film of YBCO embedded in LaAlO/sub 3/. The propagation time of electrical pulses t...Show More
Third-order local nonlinear microwave response of YBa/sub 2/Cu/sub 3/O/sub 7/ and Nb thin films
Publication Year: 2001,Page(s):131 - 134
Cited by: Papers (23)
HTS thin films continue to be of interest for passive device applications at microwave frequencies, but nonlinear effects may limit their performance. We report a set of experimental data on local third-harmonic generation at microwave frequencies (0.5 GHz) in YBa/sub 2/Cu/sub 3/O/sub 7/ and Nb thin films from 4.2 K to T/sub c/. For local investigations of the nonlinear response a probe with induc...Show More
Nonlinear analysis of disk resonators. Application to material characterization and filter design
Publication Year: 2001,Page(s):135 - 138
Cited by: Papers (12)
A procedure for the numerical prediction of the microwave nonlinear behavior (intermodulation products, degradation of quality factors, etc.) of TM/sub 010/ disk resonators has been developed. The procedure is based on relating a very general description of HTS nonlinearities with the circuit elements of a nonlinear radial transmission line. This radial transmission line is then analyzed using the...Show More
Nonlinear microwave effects in superconducting microstrip resonators based on YBCO thin films
M. Boutboul;H. Kokabi;S. Sautrot;A. Degardin;A. Kreisler;M. Fourrier
Publication Year: 2001,Page(s):139 - 142
Cited by: Papers (5)
Linear microstrip resonators based on YBaCuO thin films made by RF magnetron sputtering on MgO substrates have been characterized with transmission microwave measurements as a function of temperature (from 10 K to T/sub c/) and the incident microwave power (from -30 to 10 dBm). The variation of the resonant frequency with temperature has been used to determine the intrinsic parameters (/spl lambda...Show More
The role of interfaces in c-axis microbridges
P.J. Hirst;R.G. Humphreys;J.S. Satchell;M.J. Wooliscroft;C.L. Reeves;G. Williams;A.J. Pidduck;H. Willis
Publication Year: 2001,Page(s):143 - 146
Cited by: Papers (1)
The c-axis microbridge (CAM) junction is a c-axis interconnect between two superconducting layers. This is an attractive geometry, with low parasitic inductance suitable for single flux quantum logic circuits. Such junctions can be made by the planarisation of a mesa or growth into a window in the insulator. Typical critical current density (J/sub c/) values of the mesa type junctions are /spl sim...Show More
Effect of ion beam damage and heat treatment on interface-modified junctions
W.K. Park;H.J. Lee;J.I. Kye;J.H. Yun;S.-M. Lee;S.H. Moon;B. Oh
Publication Year: 2001,Page(s):147 - 150
Cited by: Papers (3)
We have fabricated Josephson junctions by modifying ramp edges of the base electrodes without depositing any artificial barrier layer. We irradiated the ramp edge surfaces with ion beams and heat-treated them under various conditions prior to the deposition of counter-electrode layers. After patterning the samples into ramp edge junctions using photolithography and ion beam etching, we measured th...Show More
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