Improvement of Jc for GdBCO coated conductors by annealing under strain

Takumi Suzuki, Satoshi Awaji, Hidetoshi Oguro, Kazuo Watanabe, Michinaka Sugano, Shutaro MacHiya, Masugu Sato, Teruo Izumi, Yuh Shiohara

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

GdBa2Cu3Oy coated conductors were annealed under external strain (strain-annealing). The residual strain after annealing was evaluated using synchrotron radiation. We found that the residual strain is changed by the strain-annealing. The volume fraction of the a-axis domains along the longitudinal direction is increased by compression-annealing and decreased by tension-annealing. In addition, the Jc value of the tension-annealed sample increases drastically below 70 K, although the J c value is smaller than that of the as-received sample at 77.3 K for B. The peak of the angular dependent Jc at θ = 0°, which originates from the c-axis correlated pinning, for the strain-annealed sample is much smaller than that of the as-received sample. It is considered that the shrinking of the c-axis correlated pinning because of the reduction of the twin structure and the increase of carrier doping may be related to the change in Jc properties.

Original languageEnglish
Article number6359783
JournalIEEE Transactions on Applied Superconductivity
Volume23
Issue number3
DOIs
Publication statusPublished - 2013 Jan 1

Keywords

  • REBCO conductor
  • residual strain
  • synchrotron radiation
  • twin boundary

ASJC Scopus subject areas

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

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