Effect of high-temperature heat-treatment on the pinning properties of melt-textured Nd123

N. Chikumoto; J. Yoshioka; M. Otsuka; N. Hayashi; M. Murakami

doi:10.1016/S0921-4534(97)01454-8

Effect of high-temperature heat-treatment on the pinning properties of melt-textured Nd123

N. Chikumoto, J. Yoshioka, M. Otsuka, N. Hayashi, M. Murakami

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

39 Citations (Scopus)

Abstract

We have investigated the effect of high-temperature annealing on the superconducting transition and the flux pinning properties of Nd123 melt-textured in 1% O₂-Ar. After the high-temperature annealing, a decrease in J_c was observed in most samples even though no appreciable change was observed in T_c. TEM observations and EDX analysis show that the spatial variation of the Nd/Ba ratio almost disappears after high-temperature annealing. Therefore, the observed change in J_c-B properties can be understood by a reduction in the field-induced pinning due to homogenization of Nd/Ba substitution regions. These results strongly support the idea that the secondary peak effect and high pinning performance in Nd123 can be ascribed to the presence of Nd/Ba spatial variation.

Original language	English
Pages (from-to)	253-259
Number of pages	7
Journal	Physica C: Superconductivity and its applications
Volume	281
Issue number	2-3
DOIs	https://doi.org/10.1016/S0921-4534(97)01454-8
Publication status	Published - 1997 Aug 1
Externally published	Yes

Keywords

Flux Pinning
High-temperature annealing
Melt-texture
NdBaCuO-
Peak effect
Superconducting transition

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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10.1016/S0921-4534(97)01454-8

Cite this

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title = "Effect of high-temperature heat-treatment on the pinning properties of melt-textured Nd123",

abstract = "We have investigated the effect of high-temperature annealing on the superconducting transition and the flux pinning properties of Nd123 melt-textured in 1% O2-Ar. After the high-temperature annealing, a decrease in Jc was observed in most samples even though no appreciable change was observed in Tc. TEM observations and EDX analysis show that the spatial variation of the Nd/Ba ratio almost disappears after high-temperature annealing. Therefore, the observed change in Jc-B properties can be understood by a reduction in the field-induced pinning due to homogenization of Nd/Ba substitution regions. These results strongly support the idea that the secondary peak effect and high pinning performance in Nd123 can be ascribed to the presence of Nd/Ba spatial variation.",

keywords = "Flux Pinning, High-temperature annealing, Melt-texture, NdBaCuO-, Peak effect, Superconducting transition",

author = "N. Chikumoto and J. Yoshioka and M. Otsuka and N. Hayashi and M. Murakami",

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T1 - Effect of high-temperature heat-treatment on the pinning properties of melt-textured Nd123

AU - Chikumoto, N.

AU - Yoshioka, J.

AU - Otsuka, M.

AU - Hayashi, N.

AU - Murakami, M.

PY - 1997/8/1

Y1 - 1997/8/1

N2 - We have investigated the effect of high-temperature annealing on the superconducting transition and the flux pinning properties of Nd123 melt-textured in 1% O2-Ar. After the high-temperature annealing, a decrease in Jc was observed in most samples even though no appreciable change was observed in Tc. TEM observations and EDX analysis show that the spatial variation of the Nd/Ba ratio almost disappears after high-temperature annealing. Therefore, the observed change in Jc-B properties can be understood by a reduction in the field-induced pinning due to homogenization of Nd/Ba substitution regions. These results strongly support the idea that the secondary peak effect and high pinning performance in Nd123 can be ascribed to the presence of Nd/Ba spatial variation.

AB - We have investigated the effect of high-temperature annealing on the superconducting transition and the flux pinning properties of Nd123 melt-textured in 1% O2-Ar. After the high-temperature annealing, a decrease in Jc was observed in most samples even though no appreciable change was observed in Tc. TEM observations and EDX analysis show that the spatial variation of the Nd/Ba ratio almost disappears after high-temperature annealing. Therefore, the observed change in Jc-B properties can be understood by a reduction in the field-induced pinning due to homogenization of Nd/Ba substitution regions. These results strongly support the idea that the secondary peak effect and high pinning performance in Nd123 can be ascribed to the presence of Nd/Ba spatial variation.

KW - Flux Pinning

KW - High-temperature annealing

KW - Melt-texture

KW - NdBaCuO-

KW - Peak effect

KW - Superconducting transition

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Effect of high-temperature heat-treatment on the pinning properties of melt-textured Nd123

Abstract

Keywords

ASJC Scopus subject areas

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