A new type of biepitaxial c-axis tilted YBCO Josephson junction

A novel fabrication procedure of high critical temperature superconductor Josephson junctions (HTCSJJ) has been developed by a 90 degrees rotation of YBa2Cu3O7-x c-axis around an in-plane direction, on the basis 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 features characteristic of HTCSJJ phenomenology. Even if not uniform, in some samples, the nature of the critical current I-c is completely Josephson, 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.