Effect of matrix composition on the flux pinning in a (Nd, Eu, Gd)Ba2Cu3Oy superconductor

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Abstract

In order to study the effect of matrix composition on flux pinning in the (Nd, Eu, Gd)Ba2Cu3Oy (NEG-123) bulk superconductors, we prepared two groups of samples with various rare-earth (RE) ratios using the oxygen-controlled-melt-growth (OCMG) process. For the first group, we kept the Nd content constant and varied the Eu/Gd ratio, and for the second group the Gd content was kept constant and the Nd/Eu ratio was varied. All the samples exhibited strongly developed fishtail effects and high critical current densities. Magnetization measurements revealed that the irreversibility field and the peak position systematically varied with Nd and Gd content. Scaling analyses suggested that two different pinning mechanisms are active in the NEG-123 system depending on the RE ratio. Those are ΔTc pinning and normal-type pinning, however, we found that field-induced pinning also behaves like normal-type pinning on scaling analyses when ΔTc is large. In conclusion, a difference in the peak position on scaled curves can be explained in terms of a difference in ΔTc of field-induced pinning centers.

Original languageEnglish
Pages (from-to)13911-13914
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume62
Issue number21
DOIs
Publication statusPublished - 2000 Dec 1
Externally publishedYes

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Flux pinning
flux pinning
Rare earths
Superconducting materials
matrices
Chemical analysis
Magnetization
Oxygen
rare earth elements
scaling
critical current
current density
magnetization
oxygen
curves

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

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title = "Effect of matrix composition on the flux pinning in a (Nd, Eu, Gd)Ba2Cu3Oy superconductor",
abstract = "In order to study the effect of matrix composition on flux pinning in the (Nd, Eu, Gd)Ba2Cu3Oy (NEG-123) bulk superconductors, we prepared two groups of samples with various rare-earth (RE) ratios using the oxygen-controlled-melt-growth (OCMG) process. For the first group, we kept the Nd content constant and varied the Eu/Gd ratio, and for the second group the Gd content was kept constant and the Nd/Eu ratio was varied. All the samples exhibited strongly developed fishtail effects and high critical current densities. Magnetization measurements revealed that the irreversibility field and the peak position systematically varied with Nd and Gd content. Scaling analyses suggested that two different pinning mechanisms are active in the NEG-123 system depending on the RE ratio. Those are ΔTc pinning and normal-type pinning, however, we found that field-induced pinning also behaves like normal-type pinning on scaling analyses when ΔTc is large. In conclusion, a difference in the peak position on scaled curves can be explained in terms of a difference in ΔTc of field-induced pinning centers.",
author = "Muralidhar Miryala and Masato Murakami",
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T1 - Effect of matrix composition on the flux pinning in a (Nd, Eu, Gd)Ba2Cu3Oy superconductor

AU - Miryala, Muralidhar

AU - Murakami, Masato

PY - 2000/12/1

Y1 - 2000/12/1

N2 - In order to study the effect of matrix composition on flux pinning in the (Nd, Eu, Gd)Ba2Cu3Oy (NEG-123) bulk superconductors, we prepared two groups of samples with various rare-earth (RE) ratios using the oxygen-controlled-melt-growth (OCMG) process. For the first group, we kept the Nd content constant and varied the Eu/Gd ratio, and for the second group the Gd content was kept constant and the Nd/Eu ratio was varied. All the samples exhibited strongly developed fishtail effects and high critical current densities. Magnetization measurements revealed that the irreversibility field and the peak position systematically varied with Nd and Gd content. Scaling analyses suggested that two different pinning mechanisms are active in the NEG-123 system depending on the RE ratio. Those are ΔTc pinning and normal-type pinning, however, we found that field-induced pinning also behaves like normal-type pinning on scaling analyses when ΔTc is large. In conclusion, a difference in the peak position on scaled curves can be explained in terms of a difference in ΔTc of field-induced pinning centers.

AB - In order to study the effect of matrix composition on flux pinning in the (Nd, Eu, Gd)Ba2Cu3Oy (NEG-123) bulk superconductors, we prepared two groups of samples with various rare-earth (RE) ratios using the oxygen-controlled-melt-growth (OCMG) process. For the first group, we kept the Nd content constant and varied the Eu/Gd ratio, and for the second group the Gd content was kept constant and the Nd/Eu ratio was varied. All the samples exhibited strongly developed fishtail effects and high critical current densities. Magnetization measurements revealed that the irreversibility field and the peak position systematically varied with Nd and Gd content. Scaling analyses suggested that two different pinning mechanisms are active in the NEG-123 system depending on the RE ratio. Those are ΔTc pinning and normal-type pinning, however, we found that field-induced pinning also behaves like normal-type pinning on scaling analyses when ΔTc is large. In conclusion, a difference in the peak position on scaled curves can be explained in terms of a difference in ΔTc of field-induced pinning centers.

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