Regensburg 2002 – scientific programme

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TT: Tiefe Temperaturen

TT 7: Postersitzung I: Anwendungen der Supraleitung (1-6), Dünne Schichten, Josephsonkontakte, SQUIDs (7-17), Neue und unkonv. Supraleiter(18-23), Amorphe- und Tunnelsyst. (24-28), Quantenflüssigkeiten (29-30), Syst. korr. Elektr.: Theorie I (31-45)

TT 7.6: Poster

Monday, March 11, 2002, 14:30–18:00, A

THz-Spectroscopy with YBa₂Cu₃O₇-Josephson junctions and arrays — •Andre Kaestner and Meinhard Schilling — Institut für Elektrische Messtechnik und Grundlagen der Elektrotechnik, TU Braunschweig, Hans-Sommer-Strasse 66, 38106 Braunschweig, Germany

We employ Hilbert-spectroscopy with Josephson junctions from high-temperature superconductors (HTS) in the frequency range from 70 GHz to 1.2 THz. The Josephson junctions with integrated wideband antennas from HTS are prepared on symmetric 24^o LaAlO₃ bicrystal substrates. We obtain for a 6 µm wide junction an I_CR_N-product of 170 µV at 77 K and 2.0 mV at T = 10 K. The set-up is optimized for low insertion loss over a wide frequency range from 70 GHz to 2 THz. For HF-characterization we use high-frequency sources at 20 GHz, 76 GHz and a far-infrared laser at 762 GHz and further lines in the THz-regime. Also measurements of Josephson junction arrays under high-frequency irradiation are presented. Therefore we prepared 1D- as well as 2D-Josephson junction arrays with grain-boundary and ramp-type Josephson junctions.