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Description of the transport critical current density behavior of polycrystalline superconductors as a function of the applied magnetic field

✍ Scribed by C.A.C. Passos; M.T.D. Orlando; G.L.L. Keller; J.L. Passamai Jr.; J.A. Ferreira; E.V.L. de Mello

Publisher: Elsevier Science
Year: 2009
Tongue: English
Weight: 162 KB
Volume: 404
Category: Article
ISSN: 0921-4526
DOI: 10.1016/j.physb.2009.07.062

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✦ Synopsis

A model to describe the critical current density behavior of high-T c polycrystalline superconductors is proposed for all magnetic field values. The main features of the model are as follows: the transport critical current density is controlled by the weak-link network at grain boundaries. The size distribution of weak links is well represented by a Gamma-type distribution. Finally, the tunneling critical current between grains follows a Fraunhofer diffraction pattern or a modified pattern if the applied magnetic field is lower or higher than the first critical field H c1 .

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