In-Plane Domain Control of REBCO 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 REBa$_{2}$Cu$_{\bf 3}$O$_{\bf 7-\delta }$coated conductors (REBCO-CCs) by annealing under a bending strain applied at high temperature. We succeeded in changing the volume fraction of the region where the $a$axis of REBCO aligns along the longitudinal direction of REBCO-CC, $f_{\rm A}$, up to $\simeq\! 90\%$when a compressive bending strain of $\simeq\! -1.35\%$is applied along the longitudinal direction. We found that $f_{\rm A}$evaluated by repeated X-ray diffraction measurements decreases over time if the domain-controlled REBCO-CCs with a high $f_{\rm A}$value is kept flat, whereas $f_{\rm A}$remains high if the sample remains bent. In addition, we also observed that $f_{\rm A}$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 REBCO even at room temperature when a uniaxial strain is applied to the REBCO-CC. Such a temporal variation of $f_{\rm A}$probably leads to changes in the superconducting properties, and may become important for the design of REBCO pancake coils.

Original languageEnglish
Article number9369861
JournalIEEE Transactions on Applied Superconductivity
Volume31
Issue number5
DOIs
Publication statusPublished - 2021 Aug

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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