Dresden 2003 – scientific programme
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TT: Tiefe Temperaturen
TT 8: Supraleitung: Dünne Schichten, Josephsonkontakte, SQUIDs
TT 8.11: Invited Talk
Tuesday, March 25, 2003, 12:15–12:45, HSZ304
Coupled Half-Flux Quanta Arrays — •Hans Hilgenkamp1, Ariando1, Henk-Jan Smilde1, Dave H.A. Blank1, Guus Rijnders1, Horst Rogalla1, John R. Kirtley2, and Chang C. Tsuei2 — 1Faculty of Science and Technology and MESA+ Institute, Univ. of Twente, Enschede, The Netherlands — 2IBM T.J. Watson Research Center, Yorktown Heights NY, USA
The unconventional pairing symmetry of the high temperature superconductors provides the opportunity to realize novel Josephson quantum-structures, characterized by build-in π-phase shifts. Such elements are of interest for basic studies and have also been proposed as new components in superconducting (quantum)-electronics. Under certain conditions these structures display intriguing effects, such as the spontaneous formation of magnetic half-flux quanta. Using thin film Josephson contacts between high-Tc and low-Tc superconductors, we have been able to construct arrays of coupled half-flux quanta, in various geometries. The flux states of these structures have been investigated by scanning SQUID microscopy.