1. Vortex dynamics and the critical current density in NdFeAsO0.9F0.1 single crystals.
- Author
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Adamski, A., Nassief, A.R., Krellner, C., and Abdel-Hafiez, M.
- Subjects
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VORTEX motion , *CURRENT density (Electromagnetism) , *SUPERCONDUCTORS , *MAGNETIZATION measurement , *SINGLE crystals - Abstract
The importance of type-II superconductors with strong pinning comes from their ability to carry large transport currents in the presence of a magnetic field. We report on the results of the bulk magnetization measurements in the superconducting state in clean single crystals of NdFeAsO 0.9 F 0.1 at various temperatures. The zero-temperature superconducting critical current density, J c , where the superconducting transition temperature T c reaches a maximum of 45(1) kelvin, displays a remarkable high value. The field dependence of the critical current density was analyzed within the collective pinning model. A remarkably good agreement between the experimental results and theoretical δ1 pinning curve is obtained. This indicates that pinning in NdFeAsO 0.9 F 0.1 crystal originates from spatial variation of the mean free path. Additionally, the normalized pinning force density, F p , curves verses H/H irr (H irr is the irreversibility field) were scaled using the Dew-Hughes model. Our analysis suggests that point pinning alone cannot explain the observed field variation of F p . [ABSTRACT FROM AUTHOR]
- Published
- 2018
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