Effect of Nd422 content on the trapped fields of Nd-Ba-Cu-O bulk superconductors

M. Matsui; N. Sakai; M. Murakami

doi:10.1016/S0921-4534(02)01531-9

Effect of Nd422 content on the trapped fields of Nd-Ba-Cu-O bulk superconductors

M. Matsui, N. Sakai, M. Murakami

Research output: Contribution to journal › Article › peer-review

10 Citations (Scopus)

Abstract

The effect of Nd422 content on the trapped field was studied for Nd-Ba-Cu-O superconductors. In this system, there are two dominant pinning centers of Nd422/Nd123 interfaces and chemical fluctuation in the matrix. In the present experiment, the average diameter of Nd422 was larger than 2 μm and thus excess Nd422 deteriorated both J_c-B properties and crystal growth. However, cracking was introduced in large grain samples with small Nd422 content, which could be prevented by increasing Ag₂O content from 10 to 20 wt.%. The highest trapped field of 1.4 T was achieved in the sample with a molar ratio of Nd123:Nd422 = 10:1.5 with 20 wt.% Ag₂O at 77 K. Furthermore, the secondary peak effect was observed in the field dependence of the trapped field, showing that the field induced pinning is active in large grain samples.

Original language	English
Pages (from-to)	732-737
Number of pages	6
Journal	Physica C: Superconductivity and its applications
Volume	378-381
Issue number	PART 1
DOIs	https://doi.org/10.1016/S0921-4534(02)01531-9
Publication status	Published - 2002 Oct 1
Externally published	Yes

Keywords

Bulk
Nd-Ba-Cu-O
Nd422
Pinning force
Trapped field

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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title = "Effect of Nd422 content on the trapped fields of Nd-Ba-Cu-O bulk superconductors",

abstract = "The effect of Nd422 content on the trapped field was studied for Nd-Ba-Cu-O superconductors. In this system, there are two dominant pinning centers of Nd422/Nd123 interfaces and chemical fluctuation in the matrix. In the present experiment, the average diameter of Nd422 was larger than 2 μm and thus excess Nd422 deteriorated both Jc-B properties and crystal growth. However, cracking was introduced in large grain samples with small Nd422 content, which could be prevented by increasing Ag2O content from 10 to 20 wt.%. The highest trapped field of 1.4 T was achieved in the sample with a molar ratio of Nd123:Nd422 = 10:1.5 with 20 wt.% Ag2O at 77 K. Furthermore, the secondary peak effect was observed in the field dependence of the trapped field, showing that the field induced pinning is active in large grain samples.",

keywords = "Bulk, Nd-Ba-Cu-O, Nd422, Pinning force, Trapped field",

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T1 - Effect of Nd422 content on the trapped fields of Nd-Ba-Cu-O bulk superconductors

AU - Matsui, M.

AU - Sakai, N.

AU - Murakami, M.

PY - 2002/10/1

Y1 - 2002/10/1

N2 - The effect of Nd422 content on the trapped field was studied for Nd-Ba-Cu-O superconductors. In this system, there are two dominant pinning centers of Nd422/Nd123 interfaces and chemical fluctuation in the matrix. In the present experiment, the average diameter of Nd422 was larger than 2 μm and thus excess Nd422 deteriorated both Jc-B properties and crystal growth. However, cracking was introduced in large grain samples with small Nd422 content, which could be prevented by increasing Ag2O content from 10 to 20 wt.%. The highest trapped field of 1.4 T was achieved in the sample with a molar ratio of Nd123:Nd422 = 10:1.5 with 20 wt.% Ag2O at 77 K. Furthermore, the secondary peak effect was observed in the field dependence of the trapped field, showing that the field induced pinning is active in large grain samples.

AB - The effect of Nd422 content on the trapped field was studied for Nd-Ba-Cu-O superconductors. In this system, there are two dominant pinning centers of Nd422/Nd123 interfaces and chemical fluctuation in the matrix. In the present experiment, the average diameter of Nd422 was larger than 2 μm and thus excess Nd422 deteriorated both Jc-B properties and crystal growth. However, cracking was introduced in large grain samples with small Nd422 content, which could be prevented by increasing Ag2O content from 10 to 20 wt.%. The highest trapped field of 1.4 T was achieved in the sample with a molar ratio of Nd123:Nd422 = 10:1.5 with 20 wt.% Ag2O at 77 K. Furthermore, the secondary peak effect was observed in the field dependence of the trapped field, showing that the field induced pinning is active in large grain samples.

KW - Bulk

KW - Nd-Ba-Cu-O

KW - Nd422

KW - Pinning force

KW - Trapped field

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