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5 July 1996 Josephson junctions and SQUIDs based on artificial grain boundaries in Bi2Sr2Ca2Cu3O10-thin films
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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.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Gerhard Jakob, U. Frey, H. Meffert, P. Haibach, K. Uestuener, and Hermann Adrian "Josephson junctions and SQUIDs based on artificial grain boundaries in Bi2Sr2Ca2Cu3O10-thin films", Proc. SPIE 2697, Oxide Superconductor Physics and Nano-Engineering II, (5 July 1996); https://doi.org/10.1117/12.250255
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