Dresden 2003 – scientific programme

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TT: Tiefe Temperaturen

TT 8: Supraleitung: Dünne Schichten, Josephsonkontakte, SQUIDs

TT 8.5: Talk

Tuesday, March 25, 2003, 10:45–11:00, HSZ304

Fluxons in annular intrinsic Josephson junctions — •Tobias Clauss, Andreas Weber, Virginia Oehmichen, Michael Mößle, Dieter Koelle, and Reinhold Kleiner — Universität Tübingen, Physikalisches Institut - Experimentalphysik II, Auf der Morgenstelle 14, 72076 Tübingen

Annular intrinsic Josephson junction stacks offer the possibility to study fluxon dynamics even in the absence of external magnetic fields as fluxons cannot escape from the junctions.
We have fabricated annular stacks of intrinsic Josephson junctions out of Bi₂Sr₂CaCu₂O₈ single crystals using a double side preparation technique. In addition to measurements in external magnetic fields and under irradiation of microwaves, we have investigated the samples using low temperature scanning electron microscopy (LTSEM).
All measurements show clear structures on the current voltage characteristics due to fluxon motion. Especially, while irradiating the sample with microwaves, a strong spatially dependent signal is visible by LTSEM. The experimental results are discussed and compared with numerical simulations.