Engineering of pinning sites in melt-processed (Nd0.33Eu0.33Gd0.33)Ba2Cu3Oy superconductors

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Abstract

Extremely fine normal-conducting particles could be uniformly dispersed in the superconductive matrix through a combination of Pt addition and a mixture of three different LRE (LRE: `light rare earths', i.e. Nd, Eu, Gd) elements in the LRE-Ba2Cu3Oy system. Although (Nd,Eu,Gd)2BaCuO5 powders about 3 μm in diameter were added to the precursor, we have found that Gd2BaCuO5 (Gd-211) inclusions about 0.1 μm in diameter were finely distributed in the (Nd,Eu,Gd)Ba2Cu3Oy matrix. The formation of such fine normal-conducting particles has not been achieved in any other bulk superconductors like YBa2Cu3O7 or NdBa2Cu3O7. The presence of small Gd-211 did not inhibit the function of flux pinning provided by composition fluctuations leading to a spatial scatter of the superconducting transition temperature, Tc, which is typically observed in LRE-Ba2Cu3Oy materials, which have a LRE1-xBa2-xCU3Oy-type solid solution. Therefore, two different pinning centers are simultaneously active in one sample, which is also confirmed by the pinning analysis based on the scaling formalism, and leading to a record high current density for bulk high temperature superconductors at 77 K.

Original languageEnglish
Pages (from-to)58-65
Number of pages8
JournalMaterials Science and Engineering B: Solid-State Materials for Advanced Technology
Volume65
Issue number1
DOIs
Publication statusPublished - 1999 Oct 29
Externally publishedYes

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Superconducting materials
engineering
Flux pinning
conduction
High temperature superconductors
flux pinning
matrices
high temperature superconductors
Powders
Rare earths
Superconducting transition temperature
high current
Solid solutions
solid solutions
Current density
rare earth elements
transition temperature
inclusions
current density
formalism

ASJC Scopus subject areas

  • Materials Science(all)
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

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abstract = "Extremely fine normal-conducting particles could be uniformly dispersed in the superconductive matrix through a combination of Pt addition and a mixture of three different LRE (LRE: `light rare earths', i.e. Nd, Eu, Gd) elements in the LRE-Ba2Cu3Oy system. Although (Nd,Eu,Gd)2BaCuO5 powders about 3 μm in diameter were added to the precursor, we have found that Gd2BaCuO5 (Gd-211) inclusions about 0.1 μm in diameter were finely distributed in the (Nd,Eu,Gd)Ba2Cu3Oy matrix. The formation of such fine normal-conducting particles has not been achieved in any other bulk superconductors like YBa2Cu3O7 or NdBa2Cu3O7. The presence of small Gd-211 did not inhibit the function of flux pinning provided by composition fluctuations leading to a spatial scatter of the superconducting transition temperature, Tc, which is typically observed in LRE-Ba2Cu3Oy materials, which have a LRE1-xBa2-xCU3Oy-type solid solution. Therefore, two different pinning centers are simultaneously active in one sample, which is also confirmed by the pinning analysis based on the scaling formalism, and leading to a record high current density for bulk high temperature superconductors at 77 K.",
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AB - Extremely fine normal-conducting particles could be uniformly dispersed in the superconductive matrix through a combination of Pt addition and a mixture of three different LRE (LRE: `light rare earths', i.e. Nd, Eu, Gd) elements in the LRE-Ba2Cu3Oy system. Although (Nd,Eu,Gd)2BaCuO5 powders about 3 μm in diameter were added to the precursor, we have found that Gd2BaCuO5 (Gd-211) inclusions about 0.1 μm in diameter were finely distributed in the (Nd,Eu,Gd)Ba2Cu3Oy matrix. The formation of such fine normal-conducting particles has not been achieved in any other bulk superconductors like YBa2Cu3O7 or NdBa2Cu3O7. The presence of small Gd-211 did not inhibit the function of flux pinning provided by composition fluctuations leading to a spatial scatter of the superconducting transition temperature, Tc, which is typically observed in LRE-Ba2Cu3Oy materials, which have a LRE1-xBa2-xCU3Oy-type solid solution. Therefore, two different pinning centers are simultaneously active in one sample, which is also confirmed by the pinning analysis based on the scaling formalism, and leading to a record high current density for bulk high temperature superconductors at 77 K.

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