Vertical c-axis microbridge junctions in YBa/sub 2/Cu/sub 3/O/sub 7//PrBa/sub 2/Cu/sub 3/O/sub 7/ thin films

Author

Goodyear, S.W. ; Chew, N.G. ; Humphreys, R.G. ; Satchell, J.S. ; Lander, K.

Author_Institution

DRA, Malvern, UK

Volume

5

Issue

2

fYear

1995

fDate

6/1/1995 12:00:00 AM

Firstpage

3143

Lastpage

3146

Abstract

The fabrication and measurement of microbridge junctions in the vertical c-axis direction of YBCO/PBCO/YBCO evaporated thin films is described. Single junctions show critical current modulation with applied magnetic field, the period scaling with junction size. The IV characteristics show Shapiro steps to high order when irradiated with microwaves. Initial measurements of linear arrays suggest that with further optimisation of the processing steps a reproducible junction technology could emerge. Very low inductance (L/spl ap/5-15 pH) SQUIDs have been demonstrated with dV/d/spl Phi/>1 mV//spl Phi//sub 0/ at 50 K. The vertical SQUID loop geometry of these SQUIDs has allowed a direct determination of the penetration depth as a function of temperature.<>

Keywords

SQUIDs; barium compounds; critical current density (superconductivity); electron device manufacture; inductance; penetration depth (superconductivity); praseodymium compounds; superconducting device testing; superconducting logic circuits; superconducting microbridges; yttrium compounds; 50 K; IV characteristics; SQUIDs; Shapiro steps; YBa/sub 2/Cu/sub 3/O/sub 7/-PrBa/sub 2/Cu/sub 3/O/sub 7/; critical current modulation; inductance; junction size; linear arrays; loop geometry; microbridge junctions; penetration depth; reproducible junction technology; vertical c-axis direction; Critical current; Fabrication; Geometry; Inductance; Magnetic field measurement; Magnetic modulators; SQUIDs; Temperature; Transistors; Yttrium barium copper oxide;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.403258

Filename

403258