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Proceedings Paper

Multi-layer superconducting devices made using bi-epitaxial grain boundary Josephson junctions in YBa2Cu3O7
Author(s): K. Char
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Paper Abstract

We will report advances in superconducting devices and circuits made using bi-epitaxial grain boundary Josephson junctions in YBa2Cu3O7. These bi-epitaxial grain boundary junctions are created at predetermined locations by controlling the in-plane epitaxy of YBa2Cu3O7 with a seed layer and a buffer layer on a base layer. SQUIDs made from these junctions show modulation up to 88 K and their white noise level is at the theoretical limit. Complete magnetometers coupled with multi-turn flux transformers made using multi-layer technology have magnetic field sensitivity at 77 K sufficient to be useful for many applications. Our recent success in fabricating integrated SQUIDs by combining the SQUID and multi-turn flux transformer on a single substrate is described. Low level integrated circuits with tens of bi-epitaxial grain boundary Josephson junctions have been fabricated. The current status of these circuits is reported.

Paper Details

Date Published: 1 March 1992
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Proc. SPIE 1597, Progress in High-Temperature Superconducting Transistors and Other Devices II, (1 March 1992); doi: 10.1117/12.2321842
Show Author Affiliations
K. Char, Conductus, Inc. (United States)


Published in SPIE Proceedings Vol. 1597:
Progress in High-Temperature Superconducting Transistors and Other Devices II

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