Combined effect of flux pinning by three-directional columnar defects in a field-angular region of high-Tc superconductors

Tetsuro Sueyoshi, Ryusei Enokihata, Yuka Hidaka, Masahiro Irie, Takanori Fujiyoshi, Yasuki Okuno, Norito Ishikawa

Research output: Contribution to journalArticlepeer-review

Abstract

We investigated the combined effect of flux pinning by three-directional columnar defects (CDs) in a wide field-angular range of YBa2Cu3Oy thin films, where CDs parallel to the c-axis and CDs crossing at ±θii = 45°, 60° and 80°) relative to the c-axis were installed by 200 MeV Xe-ion irradiations. The three-directional CDs with θi ≤ ±60° form a field angular curve of critical current density Jc with a broad peak centered at magnetic field (B) parallel to the c-axis, whereas the Jc shows no peaks around the crossing angles of ±θi. When the crossing angle is expanded to θi= ±80°, a drastic change in the field- angular behavior of Jc is induced: there is not a large enhancement of Jc around B || c, but two large peaks of Jc emerge at the two irradiation angles of θi= ±80°. We also demonstrated that the combined configuration consisting of CDs at θi = 0°, ±45°, ±60° and ±80° provides a uniform enhancement of Jc over a wide angular-region.

Original languageEnglish
Article number1353824
JournalPhysica C: Superconductivity and its applications
Volume582
DOIs
Publication statusPublished - 2021 Mar 15
Externally publishedYes

Keywords

  • Critical current density
  • Flux pinning
  • High-T superconductors
  • Ion-irradiation

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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