Abstract
We have prepared (Nd0.33Eu0.33Gd0.33)Ba2Cu 3Oy ('NEG') superconductors by means of melt-processing under a partial oxygen pressure of 0.1%. In these samples, we achieved a large critical current density, Jc, of 6.8 × 104 A/cm2 at T = 77 K and in an applied magnetic field, Ha = 2.5 T. Furthermore, the irreversibility field, Hirr, exceeds 7 T at 77 K for fields applied parallel to the c-axis of the sample. As additional pinning sites, we introduced up to 40 mol% (Nd,Eu,Gd)2BaCuO5 (NEG-211) particles plus Pt in analogy to YBa2Cu3Oy (YBCO) melt-processed superconductors. Microstructural observations clarified that the Pt addition was effective in reducing the size of NEG-211 second-phase particles, which led to a dramatic increase in Jc as compared to melt-processed YBa2Cu3Oy and NdBa2Cu3Oy (NdBCO). A pronounced secondary peak effect was observed in all magnetization curves obtained at 77 K, however, there is a considerable change in the shape of the magnetization loops as a function of NEG-211 content, which demonstrates the pinning provided by the NEG-211 particles in addition to the δTc-pinning caused by fluctuation in the transition temperature, Tc, like in ordinary NdBa2Cu3Oy superconductors.
| Original language | English |
|---|---|
| Pages (from-to) | 232-240 |
| Number of pages | 9 |
| Journal | Physica C: Superconductivity and its Applications |
| Volume | 313 |
| Issue number | 3-4 |
| Publication status | Published - 1999 Feb 20 |
| Externally published | Yes |
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Keywords
- (Nd,Eu,Gd)BaCuO
- (Nd,Eu,Gd)BaCuO
- Critical current density
- Flux pinning
- Melt processing
- Microstructure
- Peak effect
- Pt addition
ASJC Scopus subject areas
- Condensed Matter Physics
Cite this
Refinement of secondary phase particles for high critical current densities in (Nd,Eu,Gd)-Ba-Cu-O superconductors. / Miryala, Muralidhar; Koblischka, Michael Rudolf; Murakami, Masato.
In: Physica C: Superconductivity and its Applications, Vol. 313, No. 3-4, 20.02.1999, p. 232-240.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Refinement of secondary phase particles for high critical current densities in (Nd,Eu,Gd)-Ba-Cu-O superconductors
AU - Miryala, Muralidhar
AU - Koblischka, Michael Rudolf
AU - Murakami, Masato
PY - 1999/2/20
Y1 - 1999/2/20
N2 - We have prepared (Nd0.33Eu0.33Gd0.33)Ba2Cu 3Oy ('NEG') superconductors by means of melt-processing under a partial oxygen pressure of 0.1%. In these samples, we achieved a large critical current density, Jc, of 6.8 × 104 A/cm2 at T = 77 K and in an applied magnetic field, Ha = 2.5 T. Furthermore, the irreversibility field, Hirr, exceeds 7 T at 77 K for fields applied parallel to the c-axis of the sample. As additional pinning sites, we introduced up to 40 mol% (Nd,Eu,Gd)2BaCuO5 (NEG-211) particles plus Pt in analogy to YBa2Cu3Oy (YBCO) melt-processed superconductors. Microstructural observations clarified that the Pt addition was effective in reducing the size of NEG-211 second-phase particles, which led to a dramatic increase in Jc as compared to melt-processed YBa2Cu3Oy and NdBa2Cu3Oy (NdBCO). A pronounced secondary peak effect was observed in all magnetization curves obtained at 77 K, however, there is a considerable change in the shape of the magnetization loops as a function of NEG-211 content, which demonstrates the pinning provided by the NEG-211 particles in addition to the δTc-pinning caused by fluctuation in the transition temperature, Tc, like in ordinary NdBa2Cu3Oy superconductors.
AB - We have prepared (Nd0.33Eu0.33Gd0.33)Ba2Cu 3Oy ('NEG') superconductors by means of melt-processing under a partial oxygen pressure of 0.1%. In these samples, we achieved a large critical current density, Jc, of 6.8 × 104 A/cm2 at T = 77 K and in an applied magnetic field, Ha = 2.5 T. Furthermore, the irreversibility field, Hirr, exceeds 7 T at 77 K for fields applied parallel to the c-axis of the sample. As additional pinning sites, we introduced up to 40 mol% (Nd,Eu,Gd)2BaCuO5 (NEG-211) particles plus Pt in analogy to YBa2Cu3Oy (YBCO) melt-processed superconductors. Microstructural observations clarified that the Pt addition was effective in reducing the size of NEG-211 second-phase particles, which led to a dramatic increase in Jc as compared to melt-processed YBa2Cu3Oy and NdBa2Cu3Oy (NdBCO). A pronounced secondary peak effect was observed in all magnetization curves obtained at 77 K, however, there is a considerable change in the shape of the magnetization loops as a function of NEG-211 content, which demonstrates the pinning provided by the NEG-211 particles in addition to the δTc-pinning caused by fluctuation in the transition temperature, Tc, like in ordinary NdBa2Cu3Oy superconductors.
KW - (Nd,Eu,Gd)BaCuO
KW - (Nd,Eu,Gd)BaCuO
KW - Critical current density
KW - Flux pinning
KW - Melt processing
KW - Microstructure
KW - Peak effect
KW - Pt addition
UR - http://www.scopus.com/inward/record.url?scp=0033077399&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0033077399&partnerID=8YFLogxK
M3 - Article
VL - 313
SP - 232
EP - 240
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
SN - 0921-4534
IS - 3-4
ER -