Anomalous anisotropy of critical currents in (Sr, K)Fe2As2 tapes

Satoshi Awaji, Yushiro Nakazawa, Hidetoshi Oguro, Yuji Tsuchiya, Kazuo Watanabe, Yusuke Shimada, He Lin, Chao Yao, Xianping Zhang, Yanwei Ma

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

We measured critical currents and irreversibility fields of Ag-sheath (Sr, K)Fe2As2 tapes at various temperatures, magnetic fields and magnetic field directions. The sample tapes were made by a powder-in-tube with a hot-press process in the final heat treatments. The inverse anisotropy in J c in comparison with the effective mass anisotropy can be found in the hot-pressed (Sr, K)Fe2As2 tapes. We found that the broad c-axis peak in angular dependence of J c appears in a low field region and it decreases with increasing field and temperature. In addition, the crossover of J c anisotropy appears around 10 T at 4.2 K and the crossover field decreases with increasing temperature. It is considered that these unusual anisotropic J c behaviors may be originated by the strong random pinning center which is larger than the coherence length,

Original languageEnglish
Article number035018
JournalSuperconductor Science and Technology
Volume30
Issue number3
DOIs
Publication statusPublished - 2017 Mar

Keywords

  • Fe-based superconductor
  • anisotropy
  • critical current
  • powder in tube wire

ASJC Scopus subject areas

  • Ceramics and Composites
  • Condensed Matter Physics
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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