Flux penetration into an artificially granular high-(formula presented) superconductor

M. R. Koblischka, P. Nálevka, M. Jirsa

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Abstract

A (Formula presented) thin film is patterned into a hexagonal close-packed lattice of disks (Formula presented) which are touching each other at the circumferences in order to enable the flow of an intergranular current. Such a sample was suggested by Koblischka et al. [Appl. Phys. Lett. 70, 514 (1997)] as a model for a layered granular structure like in a (Formula presented) (Bi-2223) tape. The magnetization measurements reveal an anomalous position of the low-field peak (central peak) similar to Bi-2223 tapes. Magneto-optic imaging is employed to visualize the local-field distributions. At low magnification, the flux patterns in the intergranular area between the disks are observed. The observations at high magnification reveal the flux penetration and pinning within the disks. It is shown that such samples may serve as model samples for granular high-(Formula presented) superconductors.

Original languageEnglish
Pages (from-to)12114-12120
Number of pages7
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume59
Issue number18
DOIs
Publication statusPublished - 1999 Jan 1

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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