Regensburg 2004 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 8: Postersitzung I: Supraleitung

TT 8.25: Poster

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

Microwave absorption of BSCCO based intrinsic Josephson junctions — •Denis Vassioukov, Huabing Wang, Vyacheslav Dremov, Yury Koval, and Paul Müller — Friedrich-Alexander Universität Erlangen-Nürnberg

Recently, Wang et al. introduced a new sample fabrication method - the so called double side technique. This sample geometry has unique properties. It is possible to perform 4-point measurements and also to avoid a big pedestal of BSCCO single crystal which usually occurs in mesa-like structures. Using a combination of electron beam lithography and photolithography, we were able to prepare stacks with minimum cross sections down to 0.5 µ x 0.5 µ. These structures were imbedded into bow-tie antennas equipped with low pass filters for DC supply. We present experimental data on microwave absorption in the step-like structures at frequencies from 760 GHz to 2.5 THz. It is shown that the choice of structure design is very crucial to the absorption properties of junctions in the stack. Clear Shapiro steps were observed at positions according to the Josephson relation.