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

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

Research output: Contribution to journalArticle

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 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.

Original languageEnglish
Pages (from-to)253-259
Number of pages7
JournalPhysica C: Superconductivity and its Applications
Volume281
Issue number2-3
Publication statusPublished - 1997 Aug 1
Externally publishedYes

Fingerprint

heat treatment
Heat treatment
Annealing
annealing
Flux pinning
flux pinning
homogenizing
Temperature
Energy dispersive spectroscopy
Substitution reactions
substitutes
Transmission electron microscopy
transmission electron microscopy

Keywords

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

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Effect of high-temperature heat-treatment on the pinning properties of melt-textured Nd123. / Chikumoto, N.; Yoshioka, J.; Otsuka, M.; Hayashi, N.; Murakami, Masato.

In: Physica C: Superconductivity and its Applications, Vol. 281, No. 2-3, 01.08.1997, p. 253-259.

Research output: Contribution to journalArticle

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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.

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