Flux patterns of monofilamentary Bi2Sr2Ca2Cu3O10+δ tapes at various temperatures

Michael Rudolf Koblischka, T. H. Johansen, H. Bratsberg, P. Vase

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

By means of magneto-optic imaging, flux patterns of monofilamentary, silver-sheathed Bi2Sr2Ca2Cu3O10+δ (Bi-2223) tapes are obtained at various temperatures between 12 K and 77 K. Above 50 K, the flux distributions are found to be nearly homogeneous, implying a uniform current flow. On decreasing the temperature, the observed flux patterns develop indications of granularity. This effect is most pronounced at the lowest temperature investigated. From these observations we can deduce the temperature dependence of the transport current density, jtrans, and of the current density of the grains, jgrain. We show that the appearance of granularity in the flux patterns at low temperatures can be explained by assuming a very steep temperature dependence of the intragranular current density, being large at low T and decreasing rapidly with increasing T until at about 50 K, jgrain ≈ jtrans. The absence of granularity above 50 K shows that the current flow is here dominated by the transport currents.

Original languageEnglish
Pages (from-to)113-119
Number of pages7
JournalSuperconductor Science and Technology
Volume12
Issue number3
DOIs
Publication statusPublished - 1999 Mar 1
Externally publishedYes

Fingerprint

Tapes
tapes
Fluxes
current density
Current density
Temperature
temperature dependence
temperature
magneto-optics
Magnetooptical effects
indication
silver
Silver
Imaging techniques

ASJC Scopus subject areas

  • Ceramics and Composites
  • Condensed Matter Physics
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

Cite this

Flux patterns of monofilamentary Bi2Sr2Ca2Cu3O10+δ tapes at various temperatures. / Koblischka, Michael Rudolf; Johansen, T. H.; Bratsberg, H.; Vase, P.

In: Superconductor Science and Technology, Vol. 12, No. 3, 01.03.1999, p. 113-119.

Research output: Contribution to journalArticle

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AB - By means of magneto-optic imaging, flux patterns of monofilamentary, silver-sheathed Bi2Sr2Ca2Cu3O10+δ (Bi-2223) tapes are obtained at various temperatures between 12 K and 77 K. Above 50 K, the flux distributions are found to be nearly homogeneous, implying a uniform current flow. On decreasing the temperature, the observed flux patterns develop indications of granularity. This effect is most pronounced at the lowest temperature investigated. From these observations we can deduce the temperature dependence of the transport current density, jtrans, and of the current density of the grains, jgrain. We show that the appearance of granularity in the flux patterns at low temperatures can be explained by assuming a very steep temperature dependence of the intragranular current density, being large at low T and decreasing rapidly with increasing T until at about 50 K, jgrain ≈ jtrans. The absence of granularity above 50 K shows that the current flow is here dominated by the transport currents.

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