| Autor: |
Shahbazi, M., Wang, X. L., Lin, Z. W., Zhu, J. G., Dou, S. X., Choi, K. Y. |
| Předmět: |
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| Zdroj: |
Journal of Applied Physics; Apr2011, Vol. 109 Issue 7, p07E151-07E151-3, 1p, 6 Graphs |
| Abstrakt: |
The critical current density, Jc, flux pinning behavior and magneto- resistance results of BaFe2-xNixAs2 single crystal have been investigated in fields up to 13 T over a temperature range of 2 to 20 K. The magnetoresistance below the superconducting transition temperature (Tc) shows Arrhenius thermally activated behavior: ρ = ρoexp(-Uo(T,H)/kBT), where Uo is the thermally activated energy. BaFe2-xNixAs2 exhibits high thermally activated flux flow energy with a very weak field dependence. Jc is as high as 2 × 105 A/cm2 for zero magnetic field at 2 K. Jc was found to decrease for B < 1 T, but showed a very weak field dependence and remained nearly constant with increasing magnetic field for B > 1 T at T = 2, 5, and 10 K. Flux jumping was also observed in magnetization loops at very low temperature for large sample, which is related to the high Jc in the single crystal. A peak effect was observed at 10 K. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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