Magneto-optical studies of the uniform critical state in bulk MgB2

Details Magneto-optical studies of the uniform critical state in bulk MgB2 Magneto-optical studies of the uniform critical state in bulk MgB2

2001-07-25

arxiv.org/abs/cond-mat/0107532v1

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1088/0953-2048/14/10/301

We present a detailed magneto-optical investigation of the magnetic flux penetration in polycrystalline MgB2 slabs made by direct reaction of B and Mg. Our results unambiguously indicate a uniform, Bean critical state magnetization behavior with almost no electromagnetic granularity. From the measured magnetic flux profiles we were able to extract the temperature dependence of the critical current density Jc(T). The Jc(T) value reaches 1.8x10^5 A/cm2 at 10K and 0.12T, in good agreement with global magnetization measurements.

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