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

A model to describe the critical current density behavior of high-Tc 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 d...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 2009-10, Vol.404 (19), p.3123-3126
Main Authors: Passos, C.A.C., Orlando, M.T.D., Keller, G.L.L., Passamai, J.L., Ferreira, J.A., de Mello, E.V.L.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Critical current
Critical currents
Exact sciences and technology
High-[formula omitted] superconductor
Magnetic field
Physics
Properties of type I and type II superconductors
Proximity effects, weak links, tunneling phenomena, and josephson effects, adreev effect, sn and sns junctions
Superconductivity
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Summary:A model to describe the critical current density behavior of high-Tc 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 Hc1.
ISSN:0921-4526
1873-2135
DOI:10.1016/j.physb.2009.07.062