Josephson Effects in the Step-Edge YBa2Cu3O7-y Josephson Junctions

H. M. Cho；L. H. Lu；L. C. Ku；H. C. Yang；H. E. Horng

Chinese Journal of Physics

31卷6S期（1993 / 12 / 01）

1205 - 1208

英文

We have fabricated the step edge Josephson junctions by the standard optical photolithography technique and wet etching. The substrates were MgO(001). The step height varied from 150 to 600 nm and the width was 20 - 50 μm wide. The frequencies of the microwave irradiation varied from 8 to 18 GHz. Shapiro steps are observed and the value of the voltage step occurs at Vn = nhf/2e, where f is the frequency of the microwave, n = integers and e is the electronic charge. The critical current density shows a temperature dependence of Ic = (1 - T/Tc)^n = with n = 1.4 - 1.5. The results will be discussed.

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