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Superconducting transport characteristics of YBa2Cu3O7-δ grain boundary junctions

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4 Author(s)
Gross, R. ; Tubingen Univ., West Germany ; Chaudhari, P. ; Kawasaki, M. ; Gupta, A.

The superconducting transport of YBa2Cu3O 7-δ grain boundary junctions (GBJs) fabricated by laser ablation deposition on SrTiO3 bicrystals is discussed. For narrow GBJs with a width smaller than about four times their Josephson penetration depth, the current-voltage characteristics can be modeled closely by the resistively shunted junction (RSJ) model and the magnetic field dependence of the critical current is Fraunhofer-pattern-like. The temperature dependence of the critical current is proportional to (1-T/Tc)2 close to T c. The characteristic voltages Vc=J gbcρN, where Jgb c is the critical current density and ρN the normal resistance times unit area of the GBJs, range between 0.2 and 8 mV at 4.2 K and scale proportional to (1/ρN)1.5 . The transport characteristics of the GBJs are in agreement with a SNINS-type junction model

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Magnetics, IEEE Transactions on  (Volume:27 ,  Issue: 2 )