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Layout of a pi-SQUID which makes use of the d-wave symmetry of the macroscopic order parameter of high-Tc superconductors for device-applications. The pi-SQUID has been realized with the bicrystal-technology.
Schulz, Chesca, Goetz, Schneider, Schmehl, Bielefeldt, Hilgenkamp, Mannhart, and Tsuei. Appl. Phys. Lett. 76, 912 (2000).
Image courtesy: Dr. Jochen Mannhart, University of Augsburg, Germany.