Temperature Dependence of Critical Current in Granular Al Bridges with Different Thicknesses and Widths

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  • Temperature Dependence of Critical Curr

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Abstract

Critical currents of granular Al bridges with different thicknesses and widths have been measured as a function of temperature. The experimental values of critical current were somewhat smaller than the pair-breaking current in the Ginzburg-Landau theory, being proportional to (Tc−T)3⁄2 near the critical temperature Tc. In the lower temperature region they became to be proportional to (Tc−T). It was found from the temperature and thickness dependences that critical current seems to be governed by the mechanism, different from the pair-breaking one.<BR>Slightly below Tc, appearance of electrical resistance was observed, depending on the bridge thickness, but not on its width. It is suggested that vortices are thermally activated and their flow generates a voltage.

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