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Temperature and magnetic field dependence of critical currents in granular superconductors

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5 Author(s)
Costabile, G. ; Dept. of Phys., Salerno Univ., Italy ; De Luca, R. ; Pace, S. ; Saggese, A.
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We analyze the critical current density J/sub c/ of a two-dimensional granular superconductor by a Josephson junction network approach, taking into account shielding current effects. We show that the temperature and field dependence of J/sub c/ is not directly given by the corresponding dependences of the maximum Josephson current of a single junction. By a critical state picture we discuss the temperature and magnetic field dependence of the effective energy barrier U/sub /spl gamma// for flux motion in the array. From the knowledge of U/sub /spl gamma//, calculated in the presence of currents flowing through the junctions, the magnetic field and temperature dependence of the critical current is derived.<>

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Applied Superconductivity, IEEE Transactions on  (Volume:5 ,  Issue: 2 )