Transport properties of superconducting MgB 2 fibers under high magnetic fields

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

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3 Scopus citations


Superconducting MgB 2 fibers have been grown by using a diffusion method, in which B filaments are exposed to Mg vapor inside a folded Ta foil over a wide range of temperatures and growth times. The fibers have a diameter of about 110 μm. The radial distribution of Mg ions into B is observed over the cross-sectional area, and the transport properties of the MgB 2 fibers are examined by using a physical property measurement system. The MgB 2 fibers grown at 900°C for 2 hours show a superconducting transition at 39.8 K with ΔT c < 2.4 K. The resistance of the MgB 2 sample at room temperature is 4 Ω, and the residual resistance ratio (RRR) is estimated as 4.72. The electrical resistance of the fibers is measured in a magnet field from 0 T to 8 T. From this measurement, the upper critical field H c2 at 4 K is estimated to be more than 16 T. A small amount of magneto-resistance is detected at high magnetic fields. The current vs. voltage characteristics are measured to get critical currents.

Original languageEnglish
Pages (from-to)1040-1043
Number of pages4
JournalJournal of the Korean Physical Society
Issue number5 I
StatePublished - May 2006


  • Magneto-resistance
  • MgB fiber
  • Resistance vs. Temperature
  • Upper critical field


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