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Description of the transport critical current density behavior of polycrystalline superconductors as a function of the applied magnetic field
Authors:C.A.C. Passos  M.T.D. Orlando  J.L. Passamai Jr.  E.V.L. de Mello
Affiliation:a Departamento de Física, Universidade Federal Fluminense, Niterói - RJ 24210-340, Brazil
b High-Pressure Laboratory - Preslab, Departamento de Física, Universidade Federal do Espírito Santo, Av. Fernando Ferrari 514, Vitória 29075-910 - ES, Brazil
c Departamento de Matemática, Universidade Federal do Espírito Santo, Av. Fernando Ferrari 514, Vitória 29075-910 - ES, Brazil
Abstract:
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.
Keywords:Critical current   Magnetic field   High-Tc superconductor
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