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Irreversible Magnetization of MgB2 Superconductor
Journal of Magnetics, Volume 10, Number 4, 31 Dec 2005, Pages 157-162
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
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