Lateral-type intrinsic Josephson junctions using Y1Ba2Cu3O7-δ and Bi2Sr2Ca1Cu2O8+δ films

We observed the Josephson effect with hysteretic I-V characteristics on lateral-type grain boundary junctions using Y1Ba2Cu3O7-delta (YBCO) and Bi2Sr2Ca1Cu2O8+delta(BSCCO) films. In the case of YBCO, grain boundaries consisting of an a-axis oriented needle-like,main surrounded by c-axis oriented grains are used for Josephson junctions. The junctions using as-grown films without annealing did not show hysteretic I-V characteristics, but they show RSJ-type I-V characteristics with no hysteresis. after appropriate annealing in pure Ar, this junction property changes to have hysteretic I-V characteristics. In the case of BSCCO, grain boundaries consisting of a (110) oriented needle like grain surrounded by (001) oriented grains sire used. Hysteretic I-V characteristics are observed for the sample, indicating the presence of the intrinsic Josephson effect caused by stacked CuO2 double layers along the c-direction. (C) 1997 Elsevier Science B.V.