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

S. I. Yoo; M. Murakami; N. Sakai; T. Ohyama; T. Higuchi; M. Watahiki; M. Takahashi

doi:10.1007/BF02653011

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

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

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

26 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 (P_O2) controlled during the melt growth and thus, with lowering P_O2, the peak field (B_pk) 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 B_pk and IL were systematically depressed. However, B_pk 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 language	English
Pages (from-to)	1923-1930
Number of pages	8
Journal	Journal of Electronic Materials
Volume	24
Issue number	12
DOIs	https://doi.org/10.1007/BF02653011
Publication status	Published - 1995 Dec 1
Externally published	Yes

Keywords

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

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering
Materials Chemistry

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10.1007/BF02653011

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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 M. Murakami and N. Sakai and T. Ohyama and T. Higuchi and M. Watahiki and M. Takahashi",

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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, M.

AU - Sakai, N.

AU - Ohyama, T.

AU - Higuchi, T.

AU - Watahiki, M.

AU - Takahashi, M.

PY - 1995/12/1

Y1 - 1995/12/1

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

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

Abstract

Keywords

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