Pinning performance of (Nd,Eu,Gd)-123 superconductors

Comparison of melt-textured pellet and single crystal

M. Jirsa, M. Rames, K. Jurek, Muralidhar Miryala, P. Das, Michael Rudolf Koblischka, T. Wolf

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5 Citations (Scopus)

Abstract

We studied pinning homogeneity and the content fluctuation of light rare earth ions in a (Nd0.33Eu0.38Gd0.28)Ba2Cu 3Oy melt-textured (MT) pellet 16 mm in diameter, doped by 0.035 mol% ZnO. The pinning performance was compared to that of the recently grown (Nd0.33Eu0.2Gd0.47)Ba2Cu 3Oy single crystal. While magnetic properties of most test samples cut from the MT pellet were surprisingly uniform, two samples from the pellet center behaved significantly different. This anomaly was found to correlate with the significant departure of the Eu:Nd ratio from the average. Nearly all MT samples showed a high-field shoulder on Jc(B) curve that was attributed to the pinning effect of a nanoscopic correlated lamellar substructure filling channels between regular twin boundaries. As a result, the irreversibility field at 77 K reached in all 20 measured MT samples 9 T. In the single crystal no high-field Jc(B) shoulder was observed, and the irreversibility field at 77 K was about 6 T. The strip-like structure observed on the crystal surface was evidently of another origin than the lamellar substructure in the MT samples and did not significantly contribute to vortex pinning. The secondary peak in Jc(B) of the single crystal was quite strong, showing a well set point-like disorder. All magnetic characteristics of the single crystal were strongly affected by twin-plane channeling effect.

Original languageEnglish
Pages (from-to)25-30
Number of pages6
JournalMaterials Science and Engineering B: Solid-State Materials for Advanced Technology
Volume151
Issue number1
DOIs
Publication statusPublished - 2008 Jun 15
Externally publishedYes

Fingerprint

pellets
Superconducting materials
Single crystals
single crystals
crystals
shoulders
substructures
Rare earths
Magnetic properties
Vortex flow
crystal surfaces
homogeneity
Ions
strip
rare earth elements
Crystals
disorders
vortices
anomalies
magnetic properties

Keywords

  • (Nd,Eu,Gd)BaCuO
  • Cuprous oxides
  • High-temperature superconductors
  • Melt-textured materials
  • Superconductivity perovskites
  • Ternary compounds

ASJC Scopus subject areas

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

Cite this

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title = "Pinning performance of (Nd,Eu,Gd)-123 superconductors: Comparison of melt-textured pellet and single crystal",
abstract = "We studied pinning homogeneity and the content fluctuation of light rare earth ions in a (Nd0.33Eu0.38Gd0.28)Ba2Cu 3Oy melt-textured (MT) pellet 16 mm in diameter, doped by 0.035 mol{\%} ZnO. The pinning performance was compared to that of the recently grown (Nd0.33Eu0.2Gd0.47)Ba2Cu 3Oy single crystal. While magnetic properties of most test samples cut from the MT pellet were surprisingly uniform, two samples from the pellet center behaved significantly different. This anomaly was found to correlate with the significant departure of the Eu:Nd ratio from the average. Nearly all MT samples showed a high-field shoulder on Jc(B) curve that was attributed to the pinning effect of a nanoscopic correlated lamellar substructure filling channels between regular twin boundaries. As a result, the irreversibility field at 77 K reached in all 20 measured MT samples 9 T. In the single crystal no high-field Jc(B) shoulder was observed, and the irreversibility field at 77 K was about 6 T. The strip-like structure observed on the crystal surface was evidently of another origin than the lamellar substructure in the MT samples and did not significantly contribute to vortex pinning. The secondary peak in Jc(B) of the single crystal was quite strong, showing a well set point-like disorder. All magnetic characteristics of the single crystal were strongly affected by twin-plane channeling effect.",
keywords = "(Nd,Eu,Gd)BaCuO, Cuprous oxides, High-temperature superconductors, Melt-textured materials, Superconductivity perovskites, Ternary compounds",
author = "M. Jirsa and M. Rames and K. Jurek and Muralidhar Miryala and P. Das and Koblischka, {Michael Rudolf} and T. Wolf",
year = "2008",
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TY - JOUR

T1 - Pinning performance of (Nd,Eu,Gd)-123 superconductors

T2 - Comparison of melt-textured pellet and single crystal

AU - Jirsa, M.

AU - Rames, M.

AU - Jurek, K.

AU - Miryala, Muralidhar

AU - Das, P.

AU - Koblischka, Michael Rudolf

AU - Wolf, T.

PY - 2008/6/15

Y1 - 2008/6/15

N2 - We studied pinning homogeneity and the content fluctuation of light rare earth ions in a (Nd0.33Eu0.38Gd0.28)Ba2Cu 3Oy melt-textured (MT) pellet 16 mm in diameter, doped by 0.035 mol% ZnO. The pinning performance was compared to that of the recently grown (Nd0.33Eu0.2Gd0.47)Ba2Cu 3Oy single crystal. While magnetic properties of most test samples cut from the MT pellet were surprisingly uniform, two samples from the pellet center behaved significantly different. This anomaly was found to correlate with the significant departure of the Eu:Nd ratio from the average. Nearly all MT samples showed a high-field shoulder on Jc(B) curve that was attributed to the pinning effect of a nanoscopic correlated lamellar substructure filling channels between regular twin boundaries. As a result, the irreversibility field at 77 K reached in all 20 measured MT samples 9 T. In the single crystal no high-field Jc(B) shoulder was observed, and the irreversibility field at 77 K was about 6 T. The strip-like structure observed on the crystal surface was evidently of another origin than the lamellar substructure in the MT samples and did not significantly contribute to vortex pinning. The secondary peak in Jc(B) of the single crystal was quite strong, showing a well set point-like disorder. All magnetic characteristics of the single crystal were strongly affected by twin-plane channeling effect.

AB - We studied pinning homogeneity and the content fluctuation of light rare earth ions in a (Nd0.33Eu0.38Gd0.28)Ba2Cu 3Oy melt-textured (MT) pellet 16 mm in diameter, doped by 0.035 mol% ZnO. The pinning performance was compared to that of the recently grown (Nd0.33Eu0.2Gd0.47)Ba2Cu 3Oy single crystal. While magnetic properties of most test samples cut from the MT pellet were surprisingly uniform, two samples from the pellet center behaved significantly different. This anomaly was found to correlate with the significant departure of the Eu:Nd ratio from the average. Nearly all MT samples showed a high-field shoulder on Jc(B) curve that was attributed to the pinning effect of a nanoscopic correlated lamellar substructure filling channels between regular twin boundaries. As a result, the irreversibility field at 77 K reached in all 20 measured MT samples 9 T. In the single crystal no high-field Jc(B) shoulder was observed, and the irreversibility field at 77 K was about 6 T. The strip-like structure observed on the crystal surface was evidently of another origin than the lamellar substructure in the MT samples and did not significantly contribute to vortex pinning. The secondary peak in Jc(B) of the single crystal was quite strong, showing a well set point-like disorder. All magnetic characteristics of the single crystal were strongly affected by twin-plane channeling effect.

KW - (Nd,Eu,Gd)BaCuO

KW - Cuprous oxides

KW - High-temperature superconductors

KW - Melt-textured materials

KW - Superconductivity perovskites

KW - Ternary compounds

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U2 - 10.1016/j.mseb.2008.03.014

DO - 10.1016/j.mseb.2008.03.014

M3 - Article

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SP - 25

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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

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