In situ synthesis and superconducting properties of MgB2 fibers

J. H. Kim, H. R. Yoon, W. Jo, J. W. Kim, K. H. Kim

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2 Scopus citations


Superconducting MgB2 fibers are grown by a diffusion method, in which B filaments are exposed to Mg vapor inside a folded Ta foil over a wide range of temperature and growth time. The as-grown wires with a diameter of about 110 μm are characterized by scanning electron microscopy and energy dispersive X-ray analysis. Surface morphology of the fibers turns out to be dependent on growth temperature and mixing ratio of Mg and B. Radial distribution of Mg ions into B is observed over the cross-sectional area. Transport properties of the MgB2 fibers are investigated in magnetic fields from 0 to 8 T by use of a physical property measurement system. MgB2 fibers grown at 900 °C for 2 h show a superconducting transition at 38.1 K with an onset temperature as 41.7 K and ΔTc < 3.03 K. Resistance of the MgB2 fiber at room temperature is 4 Ω and residual resistivity ratio (RRR) is estimated as 4.72. It is estimated that the upper critical field Hc2 at 4 K is more than 16 T. In addition, a small amount of magneto-resistance is detected at high magnetic fields.

Original languageEnglish
Pages (from-to)793-796
Number of pages4
JournalPhysica C: Superconductivity and its Applications
Issue number1-2
StatePublished - 1 Oct 2006

Bibliographical note

Funding Information:
This work has been supported by a grant from KEMCO and also supported by a grant from Center for Applied Superconductivity Technology of the 21st Century Frontier R&D Program funded by the Ministry of Science and Technology, Republic of Korea. The work at SNU has been supported by the KRF by Korean Government (MOEHRD) (R08-2004-000-10228-0).


  • MgB fiber
  • Resistance vs. temperature
  • Superconducting wire
  • Upper critical field


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