Observation of record flux pinning in melt-textured NEG-123 superconductor doped by Nb, Mo, and Ti nanoparticles

Muralidhar Miryala, M. Tomita, M. Jirsa, Naomichi Sakai, Masato Murakami, I. Hirabayashi

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Flux pinning in melt-processed (Nd0.33Eu0.33Gd0.33)Ba2Cu3Oy "NEG-123" + 35 mol% Gd2BaCuO5 "NEG-211" (70 nm in size) composite doped by TiO3, MoO3 and Nb2O5 achieved record values. The optimum values of all three dopands were found to be around 0.1 mol%. Transmission electron microscope (TEM) analysis found clouds of <10 nm sized particles in the NEG-123 matrix, shifting the pinning particle size distribution to significantly lower values. TEM by energy dispersive X-ray spectroscopy (EDX) analysis clarified that these nanoparticles contained a significant amount of Nb, Mo, and Ti. Appearance of nanometer-sized defects correlated with a significantly improved flux pining at low and medium magnetic fields, which was particularly significant at high temperatures. In the Nb-doped sample, a record Jc value of 925 kA/cm2 at the secondary peak field (4.5 T) was achieved at 65 K, 640 kA/cm2 at zero field at 77 K, and 100 kA/cm2 at 90.2 K, the last value having been up to now considered as a good standard for REBa2Cu3Oy "RE-123" materials at 77 K. The greatly improved Jc-B performance in Nb/Mo/Ti doped samples can be easily translated to large-scale LRE-123 (LRE = light rare earths, Nd, Eu, Gd, Sm) blocks intended for real superconducting super-magnets applications.

Original languageEnglish
Pages (from-to)1196-1199
Number of pages4
JournalPhysica C: Superconductivity and its Applications
Volume469
Issue number15-20
DOIs
Publication statusPublished - 2009 Oct 15

Fingerprint

Flux pinning
flux pinning
Superconducting materials
Electron microscopes
electron microscopes
Nanoparticles
nanoparticles
particle size distribution
Particle size analysis
Rare earths
Magnets
magnets
rare earth elements
Magnetic fields
Fluxes
Defects
composite materials
defects
Composite materials
matrices

Keywords

  • Flux pinning
  • High J
  • LRE-BaCuO
  • Nanoparticles
  • NEG superconductor
  • TEM

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Energy Engineering and Power Technology
  • Electronic, Optical and Magnetic Materials

Cite this

Observation of record flux pinning in melt-textured NEG-123 superconductor doped by Nb, Mo, and Ti nanoparticles. / Miryala, Muralidhar; Tomita, M.; Jirsa, M.; Sakai, Naomichi; Murakami, Masato; Hirabayashi, I.

In: Physica C: Superconductivity and its Applications, Vol. 469, No. 15-20, 15.10.2009, p. 1196-1199.

Research output: Contribution to journalArticle

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