Enhancement of critical current density in (Nd, Eu, Gd)-Ba-Cu-O superconductors

M. Muralidhar; K. Segawa; M. Murakami

doi:10.1016/S0921-5107(99)00195-6

Enhancement of critical current density in (Nd, Eu, Gd)-Ba-Cu-O superconductors

M. Muralidhar, K. Segawa, M. Murakami

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

4 Citations (Scopus)

Abstract

We have achieved a large critical current density (J(c)) of 70000 A/cm² at 77 K in 2.3 T and a large irreversibility field exceeding 7 T at 77 K for the fields parallel to the c axis in (Nd, Eu, Gd)-Ba-Cu-O in which 40 mol% (Nd, Eu, Gd)₂BaCuO₅ (NEG211) second phase particles are finely dispersed in the (Nd, Eu, Gd)Ba₂Cu₃O(y) matrix and prepared by the melt process under oxygen partial pressure of 0.1%. Microstructural observations clarified that Pt addition was effective in reducing the size of NEG211 second phase particles, which led to a dramatic increase in J(c). A clear secondary peak effect was observed in the magnetization curve, suggesting that field-induced pinning is active in parallel with the pinning by NEG211 particles.

Original language	English
Pages (from-to)	42-47
Number of pages	6
Journal	Materials Science and Engineering B
Volume	65
Issue number	1
DOIs	https://doi.org/10.1016/S0921-5107(99)00195-6
Publication status	Published - 1999 Oct 29
Externally published	Yes

Keywords

(Nd, Eu, Gd)BaCuO
(Nd, Eu, Gd)BaCuOy
Critical current density
Melt process
Microstructure
Peak effect
Pt addition

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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title = "Enhancement of critical current density in (Nd, Eu, Gd)-Ba-Cu-O superconductors",

abstract = "We have achieved a large critical current density (J(c)) of 70000 A/cm2 at 77 K in 2.3 T and a large irreversibility field exceeding 7 T at 77 K for the fields parallel to the c axis in (Nd, Eu, Gd)-Ba-Cu-O in which 40 mol% (Nd, Eu, Gd)2BaCuO5 (NEG211) second phase particles are finely dispersed in the (Nd, Eu, Gd)Ba2Cu3O(y) matrix and prepared by the melt process under oxygen partial pressure of 0.1%. Microstructural observations clarified that Pt addition was effective in reducing the size of NEG211 second phase particles, which led to a dramatic increase in J(c). A clear secondary peak effect was observed in the magnetization curve, suggesting that field-induced pinning is active in parallel with the pinning by NEG211 particles.",

keywords = "(Nd, Eu, Gd)BaCuO, (Nd, Eu, Gd)BaCuOy, Critical current density, Melt process, Microstructure, Peak effect, Pt addition",

author = "M. Muralidhar and K. Segawa and M. Murakami",

year = "1999",

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doi = "10.1016/S0921-5107(99)00195-6",

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AU - Muralidhar, M.

AU - Segawa, K.

AU - Murakami, M.

PY - 1999/10/29

Y1 - 1999/10/29

N2 - We have achieved a large critical current density (J(c)) of 70000 A/cm2 at 77 K in 2.3 T and a large irreversibility field exceeding 7 T at 77 K for the fields parallel to the c axis in (Nd, Eu, Gd)-Ba-Cu-O in which 40 mol% (Nd, Eu, Gd)2BaCuO5 (NEG211) second phase particles are finely dispersed in the (Nd, Eu, Gd)Ba2Cu3O(y) matrix and prepared by the melt process under oxygen partial pressure of 0.1%. Microstructural observations clarified that Pt addition was effective in reducing the size of NEG211 second phase particles, which led to a dramatic increase in J(c). A clear secondary peak effect was observed in the magnetization curve, suggesting that field-induced pinning is active in parallel with the pinning by NEG211 particles.

AB - We have achieved a large critical current density (J(c)) of 70000 A/cm2 at 77 K in 2.3 T and a large irreversibility field exceeding 7 T at 77 K for the fields parallel to the c axis in (Nd, Eu, Gd)-Ba-Cu-O in which 40 mol% (Nd, Eu, Gd)2BaCuO5 (NEG211) second phase particles are finely dispersed in the (Nd, Eu, Gd)Ba2Cu3O(y) matrix and prepared by the melt process under oxygen partial pressure of 0.1%. Microstructural observations clarified that Pt addition was effective in reducing the size of NEG211 second phase particles, which led to a dramatic increase in J(c). A clear secondary peak effect was observed in the magnetization curve, suggesting that field-induced pinning is active in parallel with the pinning by NEG211 particles.

KW - (Nd, Eu, Gd)BaCuO

KW - (Nd, Eu, Gd)BaCuOy

KW - Critical current density

KW - Melt process

KW - Microstructure

KW - Peak effect

KW - Pt addition

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