Abstract
We observed the Josephson effect with hysteretic I− V characteristics on lateral-type grain boundary junctions using Y 1Ba 2Cu 3O 7 − δ (YBCO) and Bi 2Sr 2Ca 1Cu 2O 8 + δ (BSCCO) films. In the case of YBCO, grain boundaries consisting of an a-axis oriented needle-like grain 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 are used. Hysteretic I− V characteristics are observed for the sample, indicating the presence of the intrinsic Josephson effect caused by stacked CuO 2 double layers along the c-direction.
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