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Transport properties of superconducting MgB2 fibers under high magnetic fields

Title
Transport properties of superconducting MgB2 fibers under high magnetic fields
Authors
Kim, JHYoon, HRJo, WKim, JWKim, KH
Ewha Authors
조윌렴
SCOPUS Author ID
조윌렴scopus
Issue Date
2006
Journal Title
JOURNAL OF THE KOREAN PHYSICAL SOCIETY
ISSN
0374-4884JCR Link
Citation
vol. 48, no. 5, pp. 1040 - 1043
Keywords
MgB2 fiberresistance vs. temperatureupper critical fieldmagneto-resistance
Publisher
KOREAN PHYSICAL SOC
Indexed
SCI; SCIE; SCOPUS; KCI WOS
Abstract
Superconducting MgB2 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 mu m. The radial distribution of Mg ions into B is observed over the cross-sectional area, and the transport properties of the MgB2 fibers are examined by using a physical property measurement system. The MgB2 fibers grown at 900 degrees C for 2 hours show a superconducting transition at 39.8 K with Delta T-c < 2.4 K. The resistance of the MgB2 sample at room temperature is 4 Omega, 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.
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자연과학대학 > 물리학전공 > Journal papers
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