Melt processing for strong flux pinning in RE-Ba-Cu-O (RE: Nd, Sm, Eu, Gd) superconductors

S. I. Yoo, Masato Murakami, Naomichi Sakai, T. Ohyama, T. Higuchi, M. Watahiki, M. Takahashi

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Factors affecting a characteristic flux pinning in light rare earth (RE)-Ba-Cu-O (RE: Nd, Sm, Eu, Gd) superconductors fabricated by the oxygen-controlled-melt-growth (OCMG) process have been investigated through a comparative study. At 77K and for the applied field parallel to the c-axis of the sample (H//c), the flux pinning of all OCMG-processed REBa2Cu3O (RE123) samples studied was very sensitive to the oxygen partial pressure (PO2) controlled during the melt growth and thus, with lowering PO2, the peak field (Bpk) in the M-H loops shifted to a high field and the irreversibility line (IL) shifted to a high H-T region. For a Ndl23 sample, as the oxygen annealing temperature increased above 300‡C, both Bpk and IL were systematically depressed. However, Bpk for all systems was insensitive to the amount of the second phase (Nd4Ba2Cu2O10 (Nd422) and RE2BaCuO5 (RE211) for the other) inclusion in the superconducting RE123 matrix, supporting that the characteristic flux pinning is due to the superconducting matrix.

Original languageEnglish
Pages (from-to)1923-1930
Number of pages8
JournalJournal of Electronic Materials
Volume24
Issue number12
DOIs
Publication statusPublished - 1995 Dec
Externally publishedYes

Fingerprint

Flux pinning
flux pinning
Rare earths
Superconducting materials
rare earth elements
Oxygen
oxygen
Processing
matrices
Partial pressure
partial pressure
inclusions
Annealing
annealing
Temperature
temperature

Keywords

  • Irreversibility line
  • oxygen partial pressure
  • oxygen-controlled-melt-growth (OCMG) process
  • peak field
  • strong flux pinning

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • Electronic, Optical and Magnetic Materials
  • Materials Science(all)
  • Electrical and Electronic Engineering

Cite this

Melt processing for strong flux pinning in RE-Ba-Cu-O (RE : Nd, Sm, Eu, Gd) superconductors. / Yoo, S. I.; Murakami, Masato; Sakai, Naomichi; Ohyama, T.; Higuchi, T.; Watahiki, M.; Takahashi, M.

In: Journal of Electronic Materials, Vol. 24, No. 12, 12.1995, p. 1923-1930.

Research output: Contribution to journalArticle

Yoo, S. I. ; Murakami, Masato ; Sakai, Naomichi ; Ohyama, T. ; Higuchi, T. ; Watahiki, M. ; Takahashi, M. / Melt processing for strong flux pinning in RE-Ba-Cu-O (RE : Nd, Sm, Eu, Gd) superconductors. In: Journal of Electronic Materials. 1995 ; Vol. 24, No. 12. pp. 1923-1930.
@article{4e901c24567f48f09edd877e0ace1919,
title = "Melt processing for strong flux pinning in RE-Ba-Cu-O (RE: Nd, Sm, Eu, Gd) superconductors",
abstract = "Factors affecting a characteristic flux pinning in light rare earth (RE)-Ba-Cu-O (RE: Nd, Sm, Eu, Gd) superconductors fabricated by the oxygen-controlled-melt-growth (OCMG) process have been investigated through a comparative study. At 77K and for the applied field parallel to the c-axis of the sample (H//c), the flux pinning of all OCMG-processed REBa2Cu3O (RE123) samples studied was very sensitive to the oxygen partial pressure (PO2) controlled during the melt growth and thus, with lowering PO2, the peak field (Bpk) in the M-H loops shifted to a high field and the irreversibility line (IL) shifted to a high H-T region. For a Ndl23 sample, as the oxygen annealing temperature increased above 300‡C, both Bpk and IL were systematically depressed. However, Bpk for all systems was insensitive to the amount of the second phase (Nd4Ba2Cu2O10 (Nd422) and RE2BaCuO5 (RE211) for the other) inclusion in the superconducting RE123 matrix, supporting that the characteristic flux pinning is due to the superconducting matrix.",
keywords = "Irreversibility line, oxygen partial pressure, oxygen-controlled-melt-growth (OCMG) process, peak field, strong flux pinning",
author = "Yoo, {S. I.} and Masato Murakami and Naomichi Sakai and T. Ohyama and T. Higuchi and M. Watahiki and M. Takahashi",
year = "1995",
month = "12",
doi = "10.1007/BF02653011",
language = "English",
volume = "24",
pages = "1923--1930",
journal = "Journal of Electronic Materials",
issn = "0361-5235",
publisher = "Springer New York",
number = "12",

}

TY - JOUR

T1 - Melt processing for strong flux pinning in RE-Ba-Cu-O (RE

T2 - Nd, Sm, Eu, Gd) superconductors

AU - Yoo, S. I.

AU - Murakami, Masato

AU - Sakai, Naomichi

AU - Ohyama, T.

AU - Higuchi, T.

AU - Watahiki, M.

AU - Takahashi, M.

PY - 1995/12

Y1 - 1995/12

N2 - Factors affecting a characteristic flux pinning in light rare earth (RE)-Ba-Cu-O (RE: Nd, Sm, Eu, Gd) superconductors fabricated by the oxygen-controlled-melt-growth (OCMG) process have been investigated through a comparative study. At 77K and for the applied field parallel to the c-axis of the sample (H//c), the flux pinning of all OCMG-processed REBa2Cu3O (RE123) samples studied was very sensitive to the oxygen partial pressure (PO2) controlled during the melt growth and thus, with lowering PO2, the peak field (Bpk) in the M-H loops shifted to a high field and the irreversibility line (IL) shifted to a high H-T region. For a Ndl23 sample, as the oxygen annealing temperature increased above 300‡C, both Bpk and IL were systematically depressed. However, Bpk for all systems was insensitive to the amount of the second phase (Nd4Ba2Cu2O10 (Nd422) and RE2BaCuO5 (RE211) for the other) inclusion in the superconducting RE123 matrix, supporting that the characteristic flux pinning is due to the superconducting matrix.

AB - Factors affecting a characteristic flux pinning in light rare earth (RE)-Ba-Cu-O (RE: Nd, Sm, Eu, Gd) superconductors fabricated by the oxygen-controlled-melt-growth (OCMG) process have been investigated through a comparative study. At 77K and for the applied field parallel to the c-axis of the sample (H//c), the flux pinning of all OCMG-processed REBa2Cu3O (RE123) samples studied was very sensitive to the oxygen partial pressure (PO2) controlled during the melt growth and thus, with lowering PO2, the peak field (Bpk) in the M-H loops shifted to a high field and the irreversibility line (IL) shifted to a high H-T region. For a Ndl23 sample, as the oxygen annealing temperature increased above 300‡C, both Bpk and IL were systematically depressed. However, Bpk for all systems was insensitive to the amount of the second phase (Nd4Ba2Cu2O10 (Nd422) and RE2BaCuO5 (RE211) for the other) inclusion in the superconducting RE123 matrix, supporting that the characteristic flux pinning is due to the superconducting matrix.

KW - Irreversibility line

KW - oxygen partial pressure

KW - oxygen-controlled-melt-growth (OCMG) process

KW - peak field

KW - strong flux pinning

UR - http://www.scopus.com/inward/record.url?scp=51249167469&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=51249167469&partnerID=8YFLogxK

U2 - 10.1007/BF02653011

DO - 10.1007/BF02653011

M3 - Article

AN - SCOPUS:51249167469

VL - 24

SP - 1923

EP - 1930

JO - Journal of Electronic Materials

JF - Journal of Electronic Materials

SN - 0361-5235

IS - 12

ER -