Multi-layer superconducting devices made using bi-epitaxial grain boundary Josephson junctions in YBa2Cu3O7

K. Char

doi:10.1117/12.2321842

1 March 1992 Multi-layer superconducting devices made using bi-epitaxial grain boundary Josephson junctions in YBa2Cu3O7

K. Char

Author Affiliations +

Proceedings Volume 1597, Progress in High-Temperature Superconducting Transistors and Other Devices II; (1992) https://doi.org/10.1117/12.2321842
Event: Microelectronic Processing Integration, 1991, San Jose, CA, United States

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.

Citation Download Citation

K. Char "Multi-layer superconducting devices made using bi-epitaxial grain boundary Josephson junctions in YBa2Cu3O7", Proc. SPIE 1597, Progress in High-Temperature Superconducting Transistors and Other Devices II, (1 March 1992); https://doi.org/10.1117/12.2321842

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