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Flux Pinning and Percolation in High-TC Oxide Superconductors

Matsushita, Teruo / Ni, Baorong / Yamafuji, Kaoru

Abstract Critical current characteristics in quench and melt growth (QMG) processed Y-Ba-Cu-O are investigated by ac inductive measurements. The critical current in these samples is percolative as is observed in sintered materials. However, this percolative behavior is not caused by weak-link grain boundaries but seems to be mainly attributed to layers of nonsuperconducting solidified melt. The experimental result of magnetization critical current density is compared with the theoretical estimate from the effective medium theory. It is also found that the shielding current with very high density flows locally inside the sample. Candidates for the dominant pinning centers in QMG processed samples are also discussed.

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Flux Pinning and Percolation in High-TC Oxide Superconductors

Matsushita, Teruo / Ni, Baorong / Yamafuji, Kaoru

Abstract Critical current characteristics in quench and melt growth (QMG) processed Y-Ba-Cu-O are investigated by ac inductive measurements. The critical current in these samples is percolative as is observed in sintered materials. However, this percolative behavior is not caused by weak-link grain boundaries but seems to be mainly attributed to layers of nonsuperconducting solidified melt. The experimental result of magnetization critical current density is compared with the theoretical estimate from the effective medium theory. It is also found that the shielding current with very high density flows locally inside the sample. Candidates for the dominant pinning centers in QMG processed samples are also discussed.

Flux Pinning and Percolation in High-TC Oxide Superconductors

Matsushita, Teruo / Ni, Baorong / Yamafuji, Kaoru

Abstract Critical current characteristics in quench and melt growth (QMG) processed Y-Ba-Cu-O are investigated by ac inductive measurements. The critical current in these samples is percolative as is observed in sintered materials. However, this percolative behavior is not caused by weak-link grain boundaries but seems to be mainly attributed to layers of nonsuperconducting solidified melt. The experimental result of magnetization critical current density is compared with the theoretical estimate from the effective medium theory. It is also found that the shielding current with very high density flows locally inside the sample. Candidates for the dominant pinning centers in QMG processed samples are also discussed.

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Title:

Flux Pinning and Percolation in High-TC Oxide Superconductors

Contributors:

Matsushita, Teruo (author) / Ni, Baorong (author) / Yamafuji, Kaoru (author)

Published in:

Advances in Cryogenic Engineering Materials ; 403-412

An International Cryogenic Materials Conference Publication ; 36

Publication date:

1990-01-01

Size:

10 pages

ISBN:

978-1-4613-9882-0 , 978-1-4613-9880-6

ISSN:

DOI:

https://doi.org/10.1007/978-1-4613-9880-6_52

Type of media:

Article/Chapter (Book)

Type of material:

Electronic Resource

Language:

English

Keywords:

Critical Current Density , Effective Medium Theory , Oxide Superconductor , Flux Pinning , Transport Critical Current Density Chemistry , Biochemical Engineering , Characterization and Evaluation of Materials , Mechanical Engineering

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