Practical high T c Josephson junctions and dc SQUIDs operating above 85 K

Applied Physics Letters - Tập 58 Số 22 - Trang 2552-2554 - 1991
M. S. Di Iorio1, S. Yoshizumi1, Keedong Yang1, J. Zhang1, M. Maung1
1Biomagnetic Technologies, Inc., 9727 Pacific Heights Boulevard, San Diego, California 92121

Tóm tắt

Reproducible high Tc YBa2Cu3O7/Ag/YBa2Cu3O7 Josephson junctions have been fabricated using an entirely in situ step-edge technique. The junction process requires the deposition of a single high Tc film and the patterning is performed using standard photolithography and ion-beam etching. The junctions exhibit a well-defined supercurrent from 4.2 to 87 K and the ac Josephson effect is observed up to 80 K in response to microwave radiation. dc SQUIDs have been fabricated and show the expected periodic modulation of the critical current in a magnetic field at temperatures ranging from 4.2 to 85.7 K. All of the 56 devices fabricated and measured to date show a well-defined supercurrent from 4.2 to over 77 K.

Từ khóa


Tài liệu tham khảo

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Thông tin
Thông tin xuất bản

Applied Physics Letters

Tập 58 Số 22

2552-2554

Thông tin tác giả