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

Autor: Harnack, Oliver, Darula, Marian, Beuven, Stephan, Amatuni, Levon, Kohlstedt, Hermann
Zdroj: Journal of Low Temperature Physics; Feb1997, Vol. 106 Issue 3/4, p463-468, 6p
Abstrakt: 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. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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