Electrodynamics of closely coupled YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// junctions

Author

Booij, W.E. ; Pauza, A.J. ; Moore, D.F. ; Tarte, E.J. ; Blamire, M.G.

Author_Institution

Dept. of Mater. Sci., Cambridge Univ., UK

Volume

7

Issue

2

fYear

1997

fDate

6/1/1997 12:00:00 AM

Firstpage

3025

Lastpage

3028

Abstract

Direct electron-beam irradiation of high-T/sub c/ thin films has been used to create closely spaced Josephson junctions which operate at temperatures of 60-80 K. The electrodynamics of two junctions have been investigated by studying the dependence of the critical current on an applied magnetic field. The junctions spaced between 50 and 150 nm could be measured independently by using a narrow third electrode. Closely spaced junctions with moderate critical currents showed a strong divergence of I/sub c/s when a magnetic field was applied. We show that these results correspond with simulations of two junctions coupled by a redistribution current. At higher critical currents the same junctions show locking of their I/sub c/s. We propose a three terminal device based on these closely-spaced multiple junctions.

Keywords

Josephson effect; barium compounds; critical currents; electron beam effects; high-temperature superconductors; superconducting thin films; yttrium compounds; 60 to 80 K; YBa/sub 2/Cu/sub 3/O/sub 7/; closely coupled YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// junctions; critical current; electrodynamics; electron beam irradiation; high-T/sub c/ thin film; magnetic field; multiple junction three terminal device; Apertures; Coupling circuits; Critical current; Electrodes; Electrodynamics; Electron beams; Josephson junctions; Superconducting devices; Superconducting microwave devices; Voltage;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.621967

Filename

621967