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Proceedings Paper

Comparison of Josephson radiation properties of different YBa2Cu3O7 thin film junctions
Author(s): Gerhard Kunkel; M. Bode; F. Wang; M. I. Faley; Michael Siegel; Willi Zander; Juergen Schubert; Ulrich Poppe; Alex I. Braginski
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Paper Abstract

We have investigated the Josephson radiation from different types of YBa2Cu3O7 (YBCO) thin film junctions: step-edge (SEJ), biepitaxial, and superconductor-normal conductor- superconductor (SNS) with N=Au and PrBa2Cu3O7. The radiation was detected using a nonresonant radiometer system with a receiving frequency of 11-12 GHz. The current-voltage characteristics were measured simultaneously with the radiation spectra in the temperature range from 4.2 to 90 K. All junctions exhibited a large emission peak at a voltage which was related to the frequency through the second Josephson relation. Typically, for high temperatures, and, therefore, small critical currents, the experimental data of the radiation linewidth agreed well with the theoretical predictions of the RSJ model. At lower temperatures the experimental linewidths deviated from the theoretical values due to additional noise sources in the junctions. Some of the SEJs showed a nonmonotonic dependence of the linewidth on temperature. Such SEJ data will be discussed in terms of a model which treats the SEJ as an interferometer consisting of a parallel array of Josephson junctions.

Paper Details

Date Published: 2 July 1994
PDF: 8 pages
Proc. SPIE 2160, Superconductive Devices and Circuits, (2 July 1994); doi: 10.1117/12.181011
Show Author Affiliations
Gerhard Kunkel, Forschungszentrum Juelich GmbH (Germany)
M. Bode, Forschungszentrum Juelich GmbH (Germany)
F. Wang, Forschungszentrum Juelich GmbH (Germany)
M. I. Faley, Forschungszentrum Juelich GmbH (Germany)
Michael Siegel, Forschungszentrum Juelich GmbH (Germany)
Willi Zander, Forschungszentrum Juelich GmbH (Germany)
Juergen Schubert, Forschungszentrum Juelich GmbH (Germany)
Ulrich Poppe, Forschungszentrum Juelich GmbH (Germany)
Alex I. Braginski, Forschungszentrum Juelich GmbH (Germany)

Published in SPIE Proceedings Vol. 2160:
Superconductive Devices and Circuits
Robert A. Buhrman; John T. Clarke; Ken Daly; Roger H. Koch; Jerome A. Luine; Randy W. Simon, Editor(s)

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