Transport Properties of Josephson Junctions and SQUIDs Employing Different Types of YBCO Grain Boundaries Obtained Through the Biepitaxial Technique.

Concepts and experimental procedures to obtain different types of YBa[sub 2]Cu[sub 3]O[sub 7] grain boundaries Josephson junctions through the biepitaxial technique have been developed. Various seed layers (MgO, CeO[sub 2] and SrTiO[sub 3]) and substrates (MgO, SrTiO[sub 3]) have been used providing, for the biepitaxial technique, additional flexibility in circuit design. A detailed investigation on transport properties evidenced good performances for both junctions and superconducting quantum interference devices. Experimental evidence is given of a conventional magnetic field behavior in 45° tilt Artificial Grain Boundary (AGB) for which no π-loops are predicted along the interface. [ABSTRACT FROM AUTHOR]