Superconducting critical current density enhanced to 285 A cm-2 for Sr2VFeAsO3-δ tapes fabricated by ex situ powder-in-tube process

Suguru Iwasaki, Ryo Matsumoto, Shintaro Adachi, Yoshihiko Takano, Yoichi Kamihara

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Superconducting critical current density (J c) at 4.2 K for superconducting Sr2VFeAsO3-δ tape fabricated by powder-in-tube process was enhanced up to 285 A cm-2. Cross-sectional SEM images for superconducting Sr2VFeAsO3-δ wire/tapes indicated that void fraction f void was reduced from 12.8% for the round wire to ∼2.5% for the tapes. The decrease in f void suppresses the so-called "weak-links" and therefore enhances the J c. In order to enhance J c, the annealing condition should be optimized. The optimal annealing condition enforces the link between grains and avoids the loss of oxygen atoms in the superconducting core.

Original languageEnglish
Article number123004
JournalApplied Physics Express
Volume12
Issue number12
DOIs
Publication statusPublished - 2019 Dec 1

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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