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Proceedings Paper

Josephson junctions and SQUIDs based on artificial grain-boundaries in Bi2Sr2Ca2Cu3O10-thin films
Author(s): Gerhard Jakob; U. Frey; H. Meffert; P. Haibach; K. Uestuener; Hermann Adrian
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Paper Abstract

High quality thin films of Bi2Sr2Ca2Cu3O10 with critical temperatures of 95K were used to prepare grain boundary Josephson junctions on commercial 36.8 degrees SrTiO3-bicrystal substrates. IcRn- products of 50 (mu) V at 77 K and 0.7 mV at 4.2 have been reached. For temperatures higher than 50K the current- voltage curves of the junctions can be well described by the resistively shunted junction model and show no hysteresis. From the hysteretic behavior at low temperature we estimate a junction capacitance of 21 (mu) F/cm2. The Fraunhofer pattern of the critical current in an external applied field shows, that the junctions are inhomogeneous on a micrometers scale. The SQUID modulation of a 30 X 40 micrometers 2 wide superconducting loop containing two 10 micrometer wide junctions yields a flux-voltage transfer function of 2.7 (mu) V/(Phi) 0 at 78K.

Paper Details

Date Published: 5 July 1996
PDF: 6 pages
Proc. SPIE 2697, Oxide Superconductor Physics and Nano-Engineering II, (5 July 1996); doi: 10.1117/12.250255
Show Author Affiliations
Gerhard Jakob, Johannes Gutenberg Univ. (Germany)
U. Frey, Johannes Gutenberg Univ. (Germany)
H. Meffert, Johannes Gutenberg Univ. (Germany)
P. Haibach, Johannes Gutenberg Univ. (Germany)
K. Uestuener, Johannes Gutenberg Univ. (Germany)
Hermann Adrian, Johannes Gutenberg Univ. (Germany)

Published in SPIE Proceedings Vol. 2697:
Oxide Superconductor Physics and Nano-Engineering II
Ivan Bozovic; Davor Pavuna, Editor(s)

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