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High-frequency properties of high-T c Josephson junctions and mixing experiments in the W-band

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Abstract

We report on the high frequency properties of high-Tc superconductor (HTS) Josephson junctions using mixing experiments in the frequency range 78 GHz-119 GHz. Experiments with YBa2Cu3O7 (YBCO) step-edge (SEJ) and bicrystal junctions on LaAlO3 and MgO substrates have been performed. In order to achieve optimal junction properties we performed an oxygen plasma treatment. Junctions with RSJ-like current voltage characteristics were mounted into a heterodyne mixing setup. We obtained conversion efficiencies around-40 dB and heterodyne mixing response above 1 THz. For SEJs we observed mixing response related to a second junction in series. We also investigated self-mixing properties.

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Author notes

  1. Marian Darula

    Present address: Institute of Electrical Engineering, Slovak Academy of Sciences, SK-942 39, Bratislava, Slovak Republic

  2. Levon Amatuni

    Present address: Institute of Radiophysics & Electronics, Armenian Academy of Sciences, 378410, Ashtarak-2, Armenia

Authors and Affiliations

  1. Institut für Schicht- und Ionentechnik, Forschungszentrum Jülich GmbH, D-52425, Jülich, Germany

    Oliver Harnack, Marian Darula, Stephan Beuven, Levon Amatuni & Hermann Kohlstedt

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  1. Oliver Harnack
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  2. Marian Darula
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  3. Stephan Beuven
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  4. Levon Amatuni
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  5. Hermann Kohlstedt
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Harnack, O., Darula, M., Beuven, S. et al. High-frequency properties of high-T c Josephson junctions and mixing experiments in the W-band. J Low Temp Phys 106, 463–468 (1997). https://doi.org/10.1007/BF02399653

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  • DOI: https://doi.org/10.1007/BF02399653

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