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Magnetoresistance, transport noise and granular structure in polycrystalline superconductors
Author(s) -
GarcíaFornaris I.,
GoveaAlcaide E.,
Muné P.,
Jardim R. F.
Publication year - 2007
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200622191
Subject(s) - magnetoresistance , condensed matter physics , crystallite , superconductivity , magnetic field , intergranular corrosion , noise (video) , materials science , ceramic , work (physics) , josephson effect , hysteresis , magnetic flux , electrical resistivity and conductivity , physics , composite material , microstructure , thermodynamics , metallurgy , image (mathematics) , quantum mechanics , artificial intelligence , computer science
In this work we present a theoretical study on the magnetic field dependence of the electrical resistance R ( B a ) and the transport noise (TN) in a high‐ T c polycrystalline superconductors. In the model, we have considered the ceramic superconductor as a series‐parallel array of Josephson devices and the intergranular magnetic field is described within the framework of the intragranular flux‐trapping model. The obtained results qualitatively reproduce the hysteretic behavior of the R ( B a ) dependence in increasing and decreasing applied magnetic fields. We have found that the hysteretic behavior in the R ( B a ) dependence changes appreciably if different statistical distributions of the geometric factors of grains are used. In addition, such changes are also reflected in the TN, which is produced by the electric current rearrangement in the array with increasing applied magnetic fields. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)