Improved flux pinning and high critical current density in Fe-sheathed MgB2 wires and tapes by carbon nanotube doping

Aixia Xu, Yanwei Ma, Dongliang Wang, Zhaoshun Gao, Xianping Zhang, K. Watanabe

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


Carbon nanotube-doped Fe-sheathed MgB2 wires and tapes with different doping levels were fabricated by the in situ powder-in-tube method. The phases, microstructures and flux pinning were characterized by XRD, SEM/TEM, magnetic and transport-property measurements. It is found that carbon nanotubes (CNTs) doping resulted in a significant enhancement in the field dependence of critical current density Jc for all the added wires and tapes. The Jc in 13 T and 4.2 K for the CNTs doped tapes (optimal MgB1.9C0.1) increased by a factor of 11 compared to that of the undoped sample. The observed Jc(B) improvement in the added samples is attributable to the enhanced flux pinning caused by the CNTs doping.

Original languageEnglish
Pages (from-to)190-195
Number of pages6
JournalPhysica C: Superconductivity and its applications
Issue number1-2
Publication statusPublished - 2007 Nov 1


  • Critical current density
  • Flux-pinning
  • MgB

ASJC Scopus subject areas

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

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