Josephson junctions and SQUIDs based on artificial grain-boundaries in Bi2Sr2Ca2Cu3O10-thin films

Gerhard Jakob; U. Frey; H. Meffert; P. Haibach; K. Uestuener; Hermann Adrian

doi:10.1117/12.250255

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5 July 1996 Josephson junctions and SQUIDs based on artificial grain boundaries in Bi₂Sr₂Ca₂Cu₃O₁₀-thin films

Gerhard Jakob, U. Frey, H. Meffert, P. Haibach, K. Uestuener, Hermann Adrian

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Proceedings Volume 2697, Oxide Superconductor Physics and Nano-Engineering II; (1996) https://doi.org/10.1117/12.250255
Event: Photonics West '96, 1996, San Jose, CA, United States

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. I_cR_n- 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.

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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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