Magneto-optical characterization of iron-based superconducting wires and tapes

T. Tamegai, Q. P. Ding, H. Inoue, T. Taen, Y. Tsuchiya, S. Mohan, Y. Sun, T. Prombood, Y. Nakajima

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5 Citations (Scopus)


The critical current density, Jc, in high-quality single crystals of iron-based superconductors (IBS) has reached larger than 10 5A/cm2 at 4.2 K. This large value of Jc urged the development of potential superconducting wires or tapes based on IBS. We have fabricated superconducting wires and tapes of IBS using several techniques and made an extensive characterization by structural, transport, and magnetic measurements. The powder-in-tube method is used for (Ba, K)Fe2As 2 and Ba(Fe, Co)2As2 wires and the diffusion method is used for FeSe tape. Intra-and inter-granular J\rm c 's have been evaluated by direct transport and indirect magnetization measurements as well as using magneto-optical (MO) imaging. The intergranular Jc's at 4.2 K under self-field for (Ba, K)Fe2As2 and Ba(Fe, Co)2As2 wires and FeSe tapes are 1.3 × 10 4A/cm2, 3.8 × 103A/cm2, and 600 A/cm2, respectively. On the other hand, MO images have demonstrated that the intragranular Jc is at least one order of magnitude larger than the intergranular Jc, which is consistent with the magnetic evaluation.

Original languageEnglish
Article number6387296
JournalIEEE Transactions on Applied Superconductivity
Issue number3
Publication statusPublished - 2013
Externally publishedYes


  • Critical current density
  • homogeneity
  • iron-based superconductors
  • magneto-optical imaging

ASJC Scopus subject areas

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


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