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| Irreversible Magnetization of MgB2 Superconductor |
| Journal of Magnetics, Volume 10, Number 4, 31 Dec 2005, Pages 157-162 |
Mun-Seog Kim*  (Division of Electromagnetic Metrology, Korea Research Institute of Standards and Science), Kyu-Tae Kim(Division of Electromagnetic Metrology, Korea Research Institute of Standards and Science), Wan-Seop Kim(Division of Electromagnetic Metrology, Korea Research Institute of Standards and Science), Po Gyu Park(Division of Electromagnetic Metrology, Korea Research Institute of Standards and Science), Kyu Won Lee(Division of Electromagnetic Metrology, Korea Research Institute of Standards and Science), Sung-Ik Lee(Department of Physics, Pohang University of Science and Technology) |
| Abstract |
| We report the magnetic-field dependence of the irreversible magnetization of binary superconductor MgB2. For the temperature region of T<0.9Tc, the contribution of the bulk pinning to the magnetization overwhelms that of the surface pinning. This was evident from the fact that the magnetization curves, M(H), were well described by the critical-state model without considering the reversible magnetization and the surface pinning effect. It was also found that the M(H) curves at various temperatures scaled when the field and the magnetization were normalized by the characteristic caling factors H*(T) and M*(T), respectively. This feature suggests that the pinning mechanism determining the hysteresis in M(H) is unique below T=Tc . |
| Keywords: MgB2; irreversible magnetization; the exponential critical-state model; flux jumping; irreversibility line; surface barrier |
| DOI: |
| Full Text: PDF |
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