Regensburg 2000 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 7: Postersitzung I: Amorphe- und Tunnelsysteme (1-8), Mesoskopische Systeme (9-21), Schwere Fermionen (22-32), Kernmagnetismus (33-34), Josephson-Kontakte und SQUIDs (35-45), TT-Detektoren und Kryotechnik (46-49)

TT 7.41: Poster

Montag, 27. März 2000, 14:30–18:00, A

Realization of a Thin Film High-Tc  π-SQUID — •H. Hilgenkamp1,2, R.R. Schulz1, B. Chesca1, B. Goetz1, C.W. Schneider1, A. Schmehl1, H. Bielefeldt1, J. Mannhart1, and C.C. Tsuei31Exp. Phys. VI, Center for Electronic Correlations and Magnetism, Augsburg University, 86135 Augsburg — 2Present address: Department of Applied Physics, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands — 3IBM T.J. Watson Research Center, P.O. Box 218, Yorktown Heights, NY 10598, USA.

The predominantly dx2y2 symmetry of the order parameter in most high-Tc superconductors provides the opportunity to construct novel Josephson junction circuits, in which part of the junctions are biased with a phase-difference of π. We present fabrication and measurements of an all high-Tc dc π superconducting quantum interference device (dc π-SQUID), realized in thin film technology on a tetracrystalline substrate [1]. This device contains a standard junction and a junction with a π-phase shift. The characteristics of the π-SQUID are compared with the properties of a standard high-Tc SQUID. The unique features of the π-SQUID offer important potential for applications. This work was supported by the BMBF (project number 13N6918/1).

[1] R.R. Schulz, B. Chesca, B. Goetz, C.W. Schneider, A. Schmehl, H. Bielefeldt , H. Hilgenkamp, J. Mannhart and C.C. Tsuei, Appl. Phys. Lett., in press.

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