TRANSPORT-PROPERTIES OF BI2SR2CA2CU3O10-BOUNDARY JOSEPHSON-JUNCTIONS AND SQUIDS(DELTA BICRYSTAL GRAIN)

Josephson junctions and SQUIDs on 36.8 degrees SrTiO3 bicrystal substr ates were prepared from epitaxial Bi2Sr2Ca2Cu2O10+delta thin films wit h critical temperatures around 95K. The current-voltage characteristic s are well described by the resistively and capacitively shunted junct ion model. I(c)R(n) products of 50 mu V at 77K and 0.7mV at 4.2K have been reached. The I-c(B) dependence is symmetric to B = 0 with an I-c suppression of 90% in the first minimum. Nevertheless it turns out, th at the junctions are inhomogeneous on a mu m scale. SQUID modulations observed at 78K indicate a flux-voltage transfer function of 2.7 mu V/ Phi(0) at this temperature.