V.V. Srinivasu

Microwave power dependence of the I – V characteristics of submicron and micron YBCO constrictions

In this paper, the femtosecond laser technique was used to fabricate micron and submicron sized Josephson Junctions. The influence of an RF signal of frequency 19.5 GHz on the critical current of the micron sized Josephson junction of width 2.1 µm and the sub-micron sized Josephson junction of width 816 nm was analyzed. Both junctions showed the presence of Shapiro-like steps and critical current suppression due an increase in the RF Power. Critical current suppression occurs due to the varying magnetic field produced by the RF signal power.In this paper, the femtosecond laser technique was used to fabricate micron and submicron sized Josephson Junctions. The influence of an RF signal of frequency 19.5 GHz on the critical current of the micron sized Josephson junction of width 2.1 µm and the sub-micron sized Josephson junction of width 816 nm was analyzed. Both junctions showed the presence of Shapiro-like steps and critical current suppression due an increase in the RF Power. Critical current suppression occurs due to the varying magnetic field produced by the RF signal power.