In-plane Domain Control of <i>RE</i>BCO Coated Conductors by Annealing Under Bending Strain

Tatsunori Okada, Hidenori Misaizu, Satoshi Awaji

Research output: Contribution to journalArticlepeer-review

Abstract

We attempted to control the volume fraction of the in-plane domains of <i>RE</i>Ba<sub>2</sub>Cu<sub>3</sub>O<sub>7<i></i></sub> coated conductors (<i>RE</i>BCO-CCs) by annealing under a bending strain applied at high temperature. We succeeded in changing the volume fraction of the region where the <i>a</i> axis of <i>RE</i>BCO aligns along the longitudinal direction of <i>RE</i>BCO-CC, <i>f</i><sub>A</sub>, up to 90% when a compressive bending strain of 1.35% is applied along the longitudinal direction. We found that <i>f</i><sub>A</sub> evaluated by repeated X-ray diffraction measurements decreases over time if the domain-controlled <i>RE</i>BCO-CCs with a high <i>f</i><sub>A</sub> value is kept flat, whereas <i>f</i><sub>A</sub> remains high if the sample remains bent. In addition, we also observed that <i>f</i><sub>A</sub> in the as-received sample increases over time if the sample is exposed to a compressive bending strain at room temperature. These results suggest that oxygen atoms can migrate in <i>RE</i>BCO even at room temperature when a uniaxial strain is applied to the <i>RE</i>BCO-CC. Such a temporal variation of <i>f</i><sub>A</sub> probably leads to changes in the superconducting properties, and may become important for the design of <i>RE</i>BCO pancake coils.

Original languageEnglish
JournalIEEE Transactions on Applied Superconductivity
DOIs
Publication statusAccepted/In press - 2021

Keywords

  • Annealing
  • High-temperature superconductors
  • Superconducting films
  • X-ray diffraction

ASJC Scopus subject areas

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

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