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Josephson effect in MgB2/Ag/MgB2 step-edge junctions

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5 Author(s)
Jeong-Il Kye ; LG Electron. Inst. of Technol., Seoul, South Korea ; Ho Nyun Lee ; Joo Do Park ; Seung Hyun Moon
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We have made MgB2/Ag/MgB2 junctions using the steps formed on Al2O3(0001) substrates. The current-voltage characteristics of these superconductor-normal-superconductor (SNS) type Josephson junctions have shown nonhysteretic behavior with some excess current. The measured IcRn values were 1.2 mV at 4.2 K and 0.24 mV at 20 K. We have observed the modulation of critical current under dc magnetic field as well as Shapiro steps under 20 GHz microwave irradiation.

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Applied Superconductivity, IEEE Transactions on  (Volume:13 ,  Issue: 2 )