Transport properties of Josephson junctions and squids employing differenttypes of YBCO grain boundaries obtained through the biepitaxial technique

Concepts and experimental procedures to obtain different types of YBa2Cu3O7 grain boundaries Josephson junctions through the biepitaxial technique hav e been developed. Various seed layers (MgO, CeO2 and SrTiO3) and substrates (MgO, SrTiO3) have been used providing, for the biepitaxial technique, add itional flexibility in circuit design. A detailed investigation on transpor t properties evidenced good performances for both junctions and superconduc ting quantum interference devices. Experimental evidence is given of a conv entional magnetic field behavior in 45 degrees tilt Artificial Grain Bounda ry (AGB) for which no pi -loops are predicted along the interface.