Influence of discontinuous columnar defects on flux pinning properties in GdBCO coated conductors

Tetsuro Sueyoshi, Tetsuya Kotaki, Yuuichi Furuki, Yuusei Uraguchi, Takafumi Kai, Takanori Fujiyoshi, Yusuke Shimada, Kazuhiro Yasuda, Norito Ishikawa

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

To investigate the effect of discontinuity of 1-D pinning centers on the flux pinning in a wide range of magnetic field directions, discontinuous columnar defects (CDs) and continuous CDs were formed in GdBCO coated conductors using Xe-ion irradiations with 80 and 270 MeV, respectively. An overall shift upward in Jc, for the 80-MeV-irradiated sample compared to the 270-MeV-irradiated one, can be observed in every direction of magnetic field, which is more remarkable as temperature decreases. This implies a synergetic effect of the pinning interaction between the linearity and the discontinuity for the discontinuous CDs. When the density of CDs is lower, however, the difference in Jc between the discontinuous and the continuous CDs becomes less at lower temperature, even in the magnetic field parallel to the c-axis. At lower density of CDs, the average spacing between CDs is wider, which would hardly lead to automatic entanglement of flux lines in the discontinuous CDs, i.e., to the synergetic effect.

Original languageEnglish
Article number6966747
JournalIEEE Transactions on Applied Superconductivity
Volume25
Issue number3
DOIs
Publication statusPublished - 2015 Jun 1
Externally publishedYes

Keywords

  • Critical current density
  • discontinuous columnar defects
  • flux pinning
  • heavy-ion irradiation
  • synergetic effect

ASJC Scopus subject areas

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

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