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

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

研究成果: Article査読

56 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)36-48
ページ数13
ジャーナルPhysica C: Superconductivity and its applications
166
1-2
DOI
出版ステータスPublished - 1990 3 1
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • エネルギー工学および電力技術
  • 電子工学および電気工学

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