Determination of flux-density gradients in YBa2Cu3O7-δ superconductors using the high-resolution Faraday effect

M. R. Koblischka, N. Moser, B. Gegenheimer, H. Kronmüller

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56 Citations (Scopus)


Domain patterns of magnetic flux penetrated in YBa2Cu3O7-δ superconductors have been observed by means of a high-resolution Faraday technique. The experimental conditions for observing domain patterns with the high-resolution Faraday effect are discussed. Flux-density profiles and the related flux-density gradients were determined from an analysis of the domain patterns. An analysis of the measured flux-density gradients in single-crystals shows that twin-boundaries are not the strongest acting pinning mechanism at low temperatures. Our results support the assumption that intrinsic pinning determines the flux-density gradients and governs the critical currents. It is shown that the flux-density gradients in grains of the sintered specimens are larger than in single-crystals. The resulting thirty times greater pinning forces are measured both magneto-optically and with a SQUID-magnetometer. This behaviour may be explained by superimposed extrinsic pinning effects such as grain-boundaries.

Original languageEnglish
Pages (from-to)36-48
Number of pages13
JournalPhysica C: Superconductivity and its applications
Issue number1-2
Publication statusPublished - 1990 Mar 1
Externally publishedYes

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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