Magnetoresistance, transport noise and granular structure in polycrystalline superconductors

✍ Scribed by García-Fornaris, I. ;Govea-Alcaide, E. ;Muné, P. ;Jardim, R. F.

• Book ID: 105363841
• Publisher: John Wiley and Sons
• Year: 2007
• Tongue: English
• Weight: 538 KB
• Volume: 204
• Category: Article
• ISSN: 0031-8965
• DOI: 10.1002/pssa.200622191

✦ Synopsis

Abstract

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)