Critical current density and ultra high-voltage transmission electron microscopic image for melt-processed fine filamentary EuB2Cu 3Ox superconductors

T. Goto, K. Watanabe, E. Ban, Y. Matsui, T. Nagai, T. Yokosawa

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We have prepared fine filamentary EuBa2Cu3O x superconductors by solution spinning and melt processing to fabricate the high-Tc superconducting wire with high-critical current density (Jc) at 77 K and high-magnetic fields. The filamentary precursor was partially melted in flowing 0.1% O2 + Ar and then oxygenated. The samples in diameter of 55 μm had well aligned texture along the filament diameter as well as the length. The Tc value of the sample was 90 K. The transport Jc for the samples was measured at 77 K in applied magnetic fields up to 14T by rotating the sample in a direction of the filament diameter. Anisotropic behaviour of the field dependence of J c along the filament diameter was detected. The sample rotated the optimized angle exhibited the highest Jc value of 11,000A/cm 2 at 77K and 14T. The transmission electron microscopic image for the filamentary EuBa2Cu3Ox superconductors was observed by using ultra high-voltage transmission electron microscope to clarify the pinning center. Intergrowth of 124-phase and nano-scale particle in the orientated 123 matrix were observed. The presence of such small-scale disorders could improve flux pinning at high fields.

Original languageEnglish
Pages (from-to)103-108
Number of pages6
JournalPhysica C: Superconductivity and its applications
Volume415
Issue number3
DOIs
Publication statusPublished - 2004 Oct 15

Keywords

  • Eu123 superconductors
  • Field dependence of J
  • Filamentary
  • Ultra high-voltage TEM image

ASJC Scopus subject areas

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

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