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

M. R. Koblischka

doi:10.1016/0921-4534(96)00048-2

Defects in YBa₂Cu₃O_7-δ thin films studied by magneto-optics

M. R. Koblischka

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

By means of the magneto-optical Faraday effect, flux-density distributions are observed in laser-ablated YBa₂Cu₃O_7-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 language	English
Pages (from-to)	135-141
Number of pages	7
Journal	Physica C: Superconductivity and its applications
Volume	259
Issue number	1-2
DOIs	https://doi.org/10.1016/0921-4534(96)00048-2
Publication status	Published - 1996 Mar 1
Externally published	Yes

ASJC Scopus subject areas

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

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10.1016/0921-4534(96)00048-2

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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.",

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Defects in YBa₂Cu₃O_7-δ thin films studied by magneto-optics

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