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http://hdl.handle.net/11154/2122
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Title: | Critical currents and the Ambegaokar-Baratoff to Ginsburg-Landau crossover in granular superconductors |
Authors: | Cardoso, JL Pereyra, P |
Issue Date: | 2000 |
Abstract: | A simple expression for the transport critical current, which describes rather well the Ambegaokar-Baratoff (A-B) to Ginsburg-Landau (G-L) crossover, is obtained from an elementary analysis of a Josephson junction subject to external magnetic fields within the Ginsburg-Landau theory. We show that the order parameter in the intergrain region depends crucially on the interplay of two characteristic lengths: the superconducting coherence length xi proportional to(1-T/T-c)(-1/2) and the junction-induced superconducting decoherence length zeta(q)proportional to(1 - T/T-c)(-alpha). Data for the transport critical current in granular YBCO samples are presented, and the A-B to G-L crossovers successfully described. |
URI: | http://hdl.handle.net/11154/2122 |
ISSN: | 1098-0121 |
Appears in Collections: | Ciencias
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