Regensburg 2004 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 8: Postersitzung I: Supraleitung

TT 8.23: Poster

Montag, 8. März 2004, 14:30–19:00, Poster A

Pulse driven arrays of HTS bicrystal Josephson junctions — •Andriy Rebikov^1,2, Alexander Klushin¹, and Norbert Klein¹ — ¹Forschungszentrum Juelich GmbH, Institut fuer Schichten und Grenzflaechen, 52425, Juelich, Germany — ²Department of Radiophysics, Kiev Taras Shevchenko University, Kiev, the Ukraine

For appropriate pulse driven arrays of shunted HTS bicrystal Josephson junctions parameters of junctions such as critical current Ic, normal resistance Rn and characteristic voltage were optimised to guarantee a large first voltage step comparable with Ic. A new shunting concepts were developed and tested. With a critical current of 1 mA, the product IcRn of 20 uV matches a convenient input frequency of approximately 12 GHz. HTS arrays with 100 junctions were driven with both a broadband two-level digital code and sine wave and have shown a full frequency locking at liquid nitrogen temperature. Pulse-driven Josephson arrays are being developed for ac quantum voltage standards, for a new temperature standards and generation of arbitrary waveforms.