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 language | English |
|---|---|
| Pages (from-to) | 58-65 |
| Number of pages | 8 |
| Journal | Materials Science and Engineering B: Solid-State Materials for Advanced Technology |
| Volume | 65 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 1999 Oct 29 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
Cite this
Engineering of pinning sites in melt-processed (Nd0.33Eu0.33Gd0.33)Ba2Cu3Oy superconductors. / Koblischka, Michael Rudolf; Miryala, Muralidhar; Murakami, Masato.
In: Materials Science and Engineering B: Solid-State Materials for Advanced Technology, Vol. 65, No. 1, 29.10.1999, p. 58-65.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Engineering of pinning sites in melt-processed (Nd0.33Eu0.33Gd0.33)Ba2Cu3Oy superconductors
AU - Koblischka, Michael Rudolf
AU - Miryala, Muralidhar
AU - Murakami, Masato
PY - 1999/10/29
Y1 - 1999/10/29
N2 - 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.
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.
UR - http://www.scopus.com/inward/record.url?scp=0033204702&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0033204702&partnerID=8YFLogxK
U2 - 10.1016/S0921-5107(99)00198-1
DO - 10.1016/S0921-5107(99)00198-1
M3 - Article
VL - 65
SP - 58
EP - 65
JO - Materials Science and Engineering B: Solid-State Materials for Advanced Technology
JF - Materials Science and Engineering B: Solid-State Materials for Advanced Technology
SN - 0921-5107
IS - 1
ER -