Yj. Feng et al., CURRENT-VOLTAGE CHARACTERISTICS OF YBA2CU3O7 STEP-EDGE JUNCTIONS ON MGO SUBSTRATES, Physica. C, Superconductivity, 282, 1997, pp. 2459-2460
In this paper, we report the successful fabrication and current-voltag
e characteristics of the YBa2Cu3O7 step-edge Josephson junctions on Mg
O substrates. Our junctions were fabricated by patterning the laser de
posited YBa2Cu3O7 thin film on MgO substrates with ion-milled steps. I
nteger Shapiro steps were observed in the I-V characteristics up to 1
THz under 72 GHz external microwave irradiation. We also estimated the
effective shunting capacitance from the voltage of the Fiske resonanc
e observed.