Dresden 2003 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 14: Postersitzung III (Neue u. unkonventionelle Supraleiter, Anwendungen der Supraleitung, Dünne Schichten, JJs und SQUIDs, Schwere Fermionen, Kondo-Systeme)

TT 14.30: Poster

Mittwoch, 26. März 2003, 14:30–19:00, P2c

Characterization and selection of heart-shaped Josephson junctions suitable for experiments in the quantum regime — •A. Kemp¹, Y. Koval¹, A. Lukashenko¹, A. Wallraff^2,1, and A.V. Ustinov¹ — ¹Physikalisches Institut III, Friedrich-Alexander Universität Erlangen-Nürnberg — ²Department of Applied Physics, Yale University

We use the method described in [1] for probing the state of a fluxon in a heart-shaped Josephson junction. In this system a one-dimensional double well potential for the fluxon is formed by an applied magnetic field. In order to select junctions for experiments in the quantum regime, the samples are characterized in the high temperature limit. The properties of the effective fluxon potential are determined from thermal activation data. We apply this method to characterize samples structured using either photolithography or electron-beam lithography. [1] A. Kemp et al. Phys. stat. sol. (b) 233, No. 3,472-481 (2002)