Defects in YBa2Cu3O7-δ thin films studied by magneto-optics

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

By means of the magneto-optical Faraday effect, flux-density distributions are observed in laser-ablated YBa2Cu3O7-δ thin films. The samples investigated are found to contain numerous defects of two different classes; (1) extended linear defects of weakly superconducting material and (2) small non-superconducting particles. The influence of these defects on the flux distributions is analyzed in detail using the concept of discontinuity lines of the currents [Th. Schuster et al. Phys. Rev. B 49 (1994) 3443]. The magneto-optical flux patterns clearly reveal that an application of a critical-state model to calculate the critical current density from magnetization data is impossible when a sample contains such defects. It is shown that even in the best samples the flux fronts are not homogeneous but consist of a large number of defect-induced parabolic flux plumes.

Original languageEnglish
Pages (from-to)135-141
Number of pages7
JournalPhysica C: Superconductivity and its Applications
Volume259
Issue number1-2
DOIs
Publication statusPublished - 1996 Mar 1
Externally publishedYes

Fingerprint

Magnetooptical effects
magneto-optics
Fluxes
Thin films
Defects
defects
thin films
Faraday effect
Superconducting materials
plumes
density distribution
Magnetization
critical current
discontinuity
flux density
barium copper yttrium oxide
current density
magnetization
Lasers
lasers

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

Cite this

Defects in YBa2Cu3O7-δ thin films studied by magneto-optics. / Koblischka, Michael Rudolf.

In: Physica C: Superconductivity and its Applications, Vol. 259, No. 1-2, 01.03.1996, p. 135-141.

Research output: Contribution to journalArticle

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