Design and realization of an all d-wave dc pi-superconducting quantum interference device

The predominantly d(x2-y2)-pairing symmetry in most high-T-c superconductor s provides the opportunity to fabricate Josephson junction circuits in whic h part of the junctions are biased by a phase difference of the superconduc ting order parameter of pi. We present fabrication and measurements of an a ll high-T-c dc superconducting quantum interference device (dc SQUID) reali zed with thin-film technology, of which the Josephson junctions consist of one standard junction and one junction with a pi-phase shift. The character istics of the pi-SQUID are compared with the properties of a standard high- T-c SQUID. (C) 2000 American Institute of Physics. [S0003-6951(00)02906-5].