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Study of the Josephson Current of {\rm MgB}_{2}/{\rm Insula\tor/Pb} Tunnel Junctions

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3 Author(s)
Ke Chen ; Dept. of Phys., Pennsylvania Univ., University Park, PA, USA ; Qi Li ; Xiaoxing Xi

We have fabricated MgB2/Insulator/Pb Josephson tunnel junctions on MgB2 films deposited by hybrid physical-chemical vapor deposition using native oxide as the tunnel barrier. For the critical current of the junction on MgB2 (0001) film, its temperature dependence follows the Ambegaokar-Baratoff relation and its magnetic field dependence exhibits a Fraunhofer pattern. From analysing the magnetic field dependence of the critical current of the junction on c-axis tilted MgB2 film, we find small contribution of the Josephson current from the ab-plane tunneling, which may suggest a pi phase difference between the order parameters of MgB2pi and sigma bands.

Published in:

IEEE Transactions on Applied Superconductivity  (Volume:19 ,  Issue: 3 )