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Your search keyword '"Hunt, B.D."' showing total 43 results
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43 results on '"Hunt, B.D."'

1. Long term stability of YBCO-based Josephson junctions

Author

Vale, Leila R., Ono, R.H., Talvacchio, J., Forrester, M.G., Hunt, B.D., DiIorio, M.S., Yang, K.-Y., and Yoshizumi, S.

Subjects
High temperature superconductors -- Research, Josephson junction -- Research, Superconductive devices -- Research, Yttrium barium copper oxides -- Research, Business, Electronics, Electronics and electrical industries
Abstract

The long term stability of three distinct types of YBa2Cu3O(sub 7-x)(YBCO)-based Josephson junctions was examined and compared. These junctions include the Co-doped barrier edge superconductor-normal metal-superconductor (SNS) junctions, noble-metal SNS step-edge junctions and bicrystal junctions. Experimental results show that all three types of YBCO-based Josephson junctions show degradation in junction characteristics. It was also found that the aging effect can be reduced if an appropriate passivation layer is used.

Published
1999

2. HTS SFQ T-flip flop with directly coupled readout

Author

Sun, A.G., Durand, D.J., Murduck, J.M., Rylov, S.V., Forrester, M.G., Hunt, B.D., and Talvacchio, J.

Subjects
Electric circuits -- Design and construction, Electric current converters -- Research, High temperature superconductors -- Research, Business, Electronics, Electronics and electrical industries
Abstract

High temperature superconducting (HTS) single flip flop circuits applicable in an oscillator-counter A/C converter were designed, fabricated and tested. One major advantage of using the architecture for building an HTS A/D converter is the relatively low level of circuit complexity required. Test results are compared with projected fabrication process parameter requirements. Improvements to the design were made using JSpice and MALT.

Published
1999

3. Oxidation of multilayer HTS digital circuits

Author

Talvacchio, J., Young, R.M., Forrester, M.G., and Hunt, B.D.

Subjects
High temperature superconductors -- Research, Insulating materials -- Research, Yttrium barium copper oxides -- Research, Business, Electronics, Electronics and electrical industries
Abstract

Long annealing times, higher temperatures and higher oxygen pressure are considered impractical approaches to re-oxidation of buried YBCO in multilayer circuits. For STO insulators, plasma oxidation is an effective approach in which tuning of average junction characteristics is allowed. STO insulators also aid in determining mechanisms for junction variation. The only effective approach is oxygen via holes through SAT and SAN insulators.

Published
1999

4. Materials basis for a six-level epitaxial HTS digital circuit process

Author

Talvacchio, J., Forrester, M.G., Hunt, B.D., McCambridge, J.D., Young, R.M., Zhang, X.F., and Miller, D.J.

Subjects
Josephson junction -- Research, High temperature superconductors -- Research, Logic circuitry -- Research, Business, Electronics, Electronics and electrical industries
Abstract

A new approach is proposed for the development of high temperature superconducting single-flux quantum logic circuits using superconductor-normal-superconductor (SNS) junctions. The approach successfully fabricated small-scale circuits. The materials properties that influence YBCO-based SNS junctions' reproducibility involves low inductance and electrical isolation.

Published
1997

5. High-Tec superconductor-normal-superconductor junctions with polyimide-passivated ambient-temperature edge formation

Author

Barner, J.B., Kleinsasser, A.W., and Hunt, B.D.

Subjects
Josephson junction -- Research, High temperature superconductors -- Research, Business, Electronics, Electronics and electrical industries
Abstract

A novel superconductor-normal-superconductor Josephson junction fabrications approach is proposed. The approach involves the rotation of a YBa2Cu3O7-delta/SrTiO3 base electrode/insulator bilayer coated with a polyimide passivation layer during Ar ion milling through a reflowed photoresist mask to create omnidirectional edges. The junctions developed using the approach exhibit smaller spreads in resistance and critical current.

Published
1997

14. Narrow-band HTS microstrip combiner technology

Author

Humphreys, R.G., primary, Barrett, C.P., additional, Chew, N.G., additional, Hedges, S.J., additional, Greed, R.B., additional, Hunt, B.D., additional, Nicholson, B.F., additional, Hensen, S., additional, and Muller, G., additional

Published
1997
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32. High-T[sub c] superconductor/normal-metal/superconductor edge junctions and SQUIDs with....

Author

Hunt, B.D. and Forrester, M.G.

Subjects
*SEMICONDUCTOR junctions, *SUPERCONDUCTING quantum interference devices
Abstract

Examines the fabrication of the epitaxial, high-T[sub c] superconductor/normal-metal/superconductor (SNS) edge junction and superconducting quantum interference devices. Incorporation of several epitaxial layers; Production of the SNS edge junctions using off-axis sputtered films; Analysis of the microstrip inductance values.

Published
1996
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33. All high T[sub c] edge-geometry weak links utilizing Y-Ba-Cu-O barrier layers.

Author

Hunt, B.D., Foote, M.C., and Bajuk, L.J.

Subjects
*HIGH temperature superconductors, *CRITICAL currents, *LASER ablation, *THIN films
Abstract

Examines all high T[sub c] edge-geometry weak links using Y-Ba-Cu-O barrier layers. Deposition of layers by laser ablation at reduced growth temperatures; Variation of critical currents with barrier thickness; Impact of temperature on thin film resistivities.

Published
1991
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