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Crystal Research and Technology |
Cryst. Res. Technol. 39,
255 (2004) - Abstract -
Voltage-current characteristics of Bi-2223 superconducting tape near Tc under γ irradiation
T. S. Kayed and I. Ercan*
Department of Electrical and Electronics Engineering, Atilim University, 06836 Ankara, Turkey
*Ankara Nuclear Research and Training Center, 06100 Ankara, Turkey
| Keywords | Bi-2223, γ irradiation, critical temperature, voltage-current characteristics, kosterlitz-thouless transition |
| PACS | 74.60.-w, 74.72.Hs, 74.25.Fy, 85.25.Kx |
| DOI | 10.1002/crat.200310179 |
Voltage-current characteristics at four different applied magnetic fields (7, 20, 30, and 40 mT) of Bi2Sr2Ca2Cu3Ox superconducting tape were measured in the temperature range from 100 to 115 K. They were also measured at zero magnetic field before and after γ irradiations up to 10 MRad at different temperatures just below the critical temperature. The data were fitted to a power law expression V = I β(T) in which the exponential parameter β under 20 mT field and after irradiation is found to fluctuate around three and then drops to unity near the critical temperature which may be interpreted as a sign of Kosterlitz-Thouless transition. The electrical properties of the tape were found to be very sensitive to γ irradiation where most of the changes take place in low γ doses.
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