A NEW-TYPE OF BIEPITAXIAL C-AXIS TILTED YBCO JOSEPHSON-JUNCTION

A novel fabrication procedure of high critical temperature superconduc tor Josephson junctions (HTCSJJ) has been developed by a 90 degrees ro tation of YBa2Cu3O7-x c-axis around an in-plane direction, on the basi s of concepts of the biepitaxial technique. YBa2Cu3O7-x grows oriented along (001) direction on a MgO seed layer deposited on a (110) SrTiO3 substrate and along (110) direction on the bare substrate. Josephson junctions of good quality were obtained exhibiting RSJ behavior and fe atures characteristic of HTCSJJ phenomenology. Even if not uniform, in some samples, the nature of the critical current I-c is completely Jo sephson, as resulting from the I-c dependence on the applied magnetic field. The maximum measured I(c)R(N) value at T=4.2 K is 2 mV.