Development of 3 terminal devices based on asymmetric, long, YBCO Josephson junctions

Author

Isaac, S.P. ; Tarte, E.J. ; Baudenbacher, F.J. ; Blamire, M.G.

Author_Institution

Interdisciplinary Res. Centre in Superconductivity, Cambridge Univ., UK

Volume

7

Issue

2

fYear

1997

fDate

6/1/1997 12:00:00 AM

Firstpage

2619

Lastpage

2622

Abstract

The critical current of long, asymmetric Josephson junctions, I/sub c/, is highly dependent on the applied magnetic field and the geometry. Nearby currents are able to significantly modulate I/sub c/, leading to many possible devices. We have fabricated asymmetric long junctions (1-32 /spl mu/m) in YBCO thin films deposited on SrTiO/sub 3/ bicrystals that show improved sensitivity to control fields compared with symmetrically biased structures. The effect of the size and shape of the structures has been investigated in order to optimise the gain and critical current. We have compared our results to simulations.

Keywords

Josephson effect; barium compounds; critical current density (superconductivity); electron device manufacture; magnetic field effects; superconducting device testing; superconducting thin films; superconducting transistors; yttrium compounds; 1 to 32 micron; SrTiO/sub 3/; YBaCuO-SrTiO/sub 3/; applied magnetic field; asymmetric long Josephson junctions; control fields; critical current; gain; shape; superconducting thin films; symmetrically biased structures; three-terminal devices; Critical current; Electrodes; Geometry; Grain boundaries; Josephson junctions; Magnetic fields; Magnetic films; Superconducting films; Superconducting magnets; Yttrium barium copper oxide;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.621776

Filename

621776