Flux pinning in melt-grown NdBa2Cu3Oy and SmBa2Cu3Oy superconductors

Masato Murakami; Sang Im Yoo; Takamitsu Higuchi; Naomichi Sakai; Jurgen Weltz; Naoki Koshizuka; Shoji Tanaka

doi:10.1143/JJAP.33.L715

Flux pinning in melt-grown NdBa₂Cu₃O_y and SmBa₂Cu₃O_y superconductors

Masato Murakami, Sang Im Yoo, Takamitsu Higuchi, Naomichi Sakai, Jurgen Weltz, Naoki Koshizuka, Shoji Tanaka

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

412 Citations (Scopus)

Abstract

REBa₂Cu₃O_y superconductors with rare earth (RE) ions with large radii (RE: La, Nd, Sm) exhibit relatively low T_c due to the presence of RE-Ba solid solution. We have found that this solid solution can be suppressed if these superconductors are melt processed in a reduced oxygen atmosphere. We have also found that critical current densities of these superconductors are higher than those of melt processed YBa₂Cu₃O_y with fine Y₂BaCuO₅ inclusions in a high field region. The irreversibility line was also shifted toward the higher H-T region. We believe that flux pinning in these superconductors is ascribable to a finely distributed RE(Ba_1–x, RE_x)₂Cu₃O_y phase in a good superconductive matrix.

Original language	English
Pages (from-to)	L715-L717
Journal	Japanese Journal of Applied Physics
Volume	33
Issue number	5
DOIs	https://doi.org/10.1143/JJAP.33.L715
Publication status	Published - 1994 May
Externally published	Yes

Keywords

Critical current density
Flux pinning
Irreversibility field
Melt process
NdBaCuO
Oxygen partial pressure
SmBaCuO
Solid solution

ASJC Scopus subject areas

Engineering(all)
Physics and Astronomy(all)

Access to Document

10.1143/JJAP.33.L715

Cite this

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title = "Flux pinning in melt-grown NdBa2Cu3Oy and SmBa2Cu3Oy superconductors",

abstract = "REBa2Cu3Oy superconductors with rare earth (RE) ions with large radii (RE: La, Nd, Sm) exhibit relatively low Tc due to the presence of RE-Ba solid solution. We have found that this solid solution can be suppressed if these superconductors are melt processed in a reduced oxygen atmosphere. We have also found that critical current densities of these superconductors are higher than those of melt processed YBa2Cu3Oy with fine Y2BaCuO5 inclusions in a high field region. The irreversibility line was also shifted toward the higher H-T region. We believe that flux pinning in these superconductors is ascribable to a finely distributed RE(Ba1–x, REx)2Cu3Oy phase in a good superconductive matrix.",

keywords = "Critical current density, Flux pinning, Irreversibility field, Melt process, NdBaCuO, Oxygen partial pressure, SmBaCuO, Solid solution",

author = "Masato Murakami and Yoo, {Sang Im} and Takamitsu Higuchi and Naomichi Sakai and Jurgen Weltz and Naoki Koshizuka and Shoji Tanaka",

year = "1994",

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AU - Murakami, Masato

AU - Yoo, Sang Im

AU - Higuchi, Takamitsu

AU - Sakai, Naomichi

AU - Weltz, Jurgen

AU - Koshizuka, Naoki

AU - Tanaka, Shoji

PY - 1994/5

Y1 - 1994/5

N2 - REBa2Cu3Oy superconductors with rare earth (RE) ions with large radii (RE: La, Nd, Sm) exhibit relatively low Tc due to the presence of RE-Ba solid solution. We have found that this solid solution can be suppressed if these superconductors are melt processed in a reduced oxygen atmosphere. We have also found that critical current densities of these superconductors are higher than those of melt processed YBa2Cu3Oy with fine Y2BaCuO5 inclusions in a high field region. The irreversibility line was also shifted toward the higher H-T region. We believe that flux pinning in these superconductors is ascribable to a finely distributed RE(Ba1–x, REx)2Cu3Oy phase in a good superconductive matrix.

AB - REBa2Cu3Oy superconductors with rare earth (RE) ions with large radii (RE: La, Nd, Sm) exhibit relatively low Tc due to the presence of RE-Ba solid solution. We have found that this solid solution can be suppressed if these superconductors are melt processed in a reduced oxygen atmosphere. We have also found that critical current densities of these superconductors are higher than those of melt processed YBa2Cu3Oy with fine Y2BaCuO5 inclusions in a high field region. The irreversibility line was also shifted toward the higher H-T region. We believe that flux pinning in these superconductors is ascribable to a finely distributed RE(Ba1–x, REx)2Cu3Oy phase in a good superconductive matrix.

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