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

Michael Rudolf Koblischka, N. Moser, B. Gegenheimer, H. Kronmüller

Research output: Contribution to journalArticle

56 Citations (Scopus)

Abstract

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
Volume166
Issue number1-2
DOIs
Publication statusPublished - 1990 Mar 1
Externally publishedYes

Fingerprint

Faraday effect
Superconducting materials
flux density
Fluxes
gradients
high resolution
Single crystals
Critical currents
SQUIDs
single crystals
Magnetometers
Magnetic flux
magnetometers
magnetic flux
critical current
Grain boundaries
grain boundaries
barium copper yttrium oxide
profiles

ASJC Scopus subject areas

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

Cite this

Determination of flux-density gradients in YBa2Cu3O7-δ superconductors using the high-resolution Faraday effect. / Koblischka, Michael Rudolf; Moser, N.; Gegenheimer, B.; Kronmüller, H.

In: Physica C: Superconductivity and its Applications, Vol. 166, No. 1-2, 01.03.1990, p. 36-48.

Research output: Contribution to journalArticle

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