Very high values of Jc obtained in NdBa2Cu3Ox by use of the U/n process

Roy Weinstein; Ravi Persad Sawh; Drew Parks; Masato Murakami; Tadashi Mochida; Noriko Chikumoto; Gernot Krabbes; Wolfgang Bieger

doi:10.1016/S0921-4534(02)01321-7

Very high values of J_c obtained in NdBa₂Cu₃O_x by use of the U/n process

Roy Weinstein, Ravi Persad Sawh, Drew Parks, Masato Murakami, Tadashi Mochida, Noriko Chikumoto, Gernot Krabbes, Wolfgang Bieger

Research output: Contribution to journal › Article

13 Citations (Scopus)

Abstract

The U/n process has been used to introduce quasi-columnar pinning centers into Nd123, textured in 1% O₂, 99% Ar. The process involves adding ²³⁵U to precursor powders of the superconductor, texturing, and irradiating with thermal neutrons. The two resulting ions, from each nuclear fission, cause aligned discontinuous electronic damage of length ∼5.4 μm, which acts as a pinning center. Best results for J_c require U deposits spaced by s ≤ 5.4 μm. This has been achieved by deposits containing two foreign elements, U and Zr, and three native elements. The deposits of UZrNdBaO and Nd422 refined by the Zr, act as additional non-aligned pinning centers. The U/n process increases J_c by a factor R_J ≥ 10, to values of J_c ∼ 274 kA/cm² at T = 77 K, B = 666 G.

Original language	English
Pages (from-to)	214-222
Number of pages	9
Journal	Physica C: Superconductivity and its applications
Volume	383
Issue number	3
DOIs	https://doi.org/10.1016/S0921-4534(02)01321-7
Publication status	Published - 2002 Dec 15
Externally published	Yes

Keywords

Critical current density
Flux pinning
Irradiation effect

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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Weinstein, R., Sawh, R. P., Parks, D., Murakami, M., Mochida, T., Chikumoto, N., Krabbes, G., & Bieger, W. (2002). Very high values of J_c obtained in NdBa₂Cu₃O_x by use of the U/n process. Physica C: Superconductivity and its applications, 383(3), 214-222. https://doi.org/10.1016/S0921-4534(02)01321-7

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abstract = "The U/n process has been used to introduce quasi-columnar pinning centers into Nd123, textured in 1% O2, 99% Ar. The process involves adding 235U to precursor powders of the superconductor, texturing, and irradiating with thermal neutrons. The two resulting ions, from each nuclear fission, cause aligned discontinuous electronic damage of length ∼5.4 μm, which acts as a pinning center. Best results for Jc require U deposits spaced by s ≤ 5.4 μm. This has been achieved by deposits containing two foreign elements, U and Zr, and three native elements. The deposits of UZrNdBaO and Nd422 refined by the Zr, act as additional non-aligned pinning centers. The U/n process increases Jc by a factor RJ ≥ 10, to values of Jc ∼ 274 kA/cm2 at T = 77 K, B = 666 G.",

keywords = "Critical current density, Flux pinning, Irradiation effect",

author = "Roy Weinstein and Sawh, {Ravi Persad} and Drew Parks and Masato Murakami and Tadashi Mochida and Noriko Chikumoto and Gernot Krabbes and Wolfgang Bieger",

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AU - Weinstein, Roy

AU - Sawh, Ravi Persad

AU - Parks, Drew

AU - Murakami, Masato

AU - Mochida, Tadashi

AU - Chikumoto, Noriko

AU - Krabbes, Gernot

AU - Bieger, Wolfgang

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AB - The U/n process has been used to introduce quasi-columnar pinning centers into Nd123, textured in 1% O2, 99% Ar. The process involves adding 235U to precursor powders of the superconductor, texturing, and irradiating with thermal neutrons. The two resulting ions, from each nuclear fission, cause aligned discontinuous electronic damage of length ∼5.4 μm, which acts as a pinning center. Best results for Jc require U deposits spaced by s ≤ 5.4 μm. This has been achieved by deposits containing two foreign elements, U and Zr, and three native elements. The deposits of UZrNdBaO and Nd422 refined by the Zr, act as additional non-aligned pinning centers. The U/n process increases Jc by a factor RJ ≥ 10, to values of Jc ∼ 274 kA/cm2 at T = 77 K, B = 666 G.

KW - Critical current density

KW - Flux pinning

KW - Irradiation effect

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