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Superconducting Properties of MgB2 Bulk Materials Prepared by High Pressure Sintering

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arxiv cond-mat/0102167 v1 pith:3FMNFFSW submitted 2001-02-09 cond-mat.supr-con

Superconducting Properties of MgB2 Bulk Materials Prepared by High Pressure Sintering

Y. Takano , H. Takeya , H. Fujii , H. Kumakura , T. Hatano , K. Togano , H. Kito , H. Ihara This is my paper
classification cond-mat.supr-con
keywords bulkcriticalfieldcurveestimatedhighmagnetizationmaterials
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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High-density bulk materials of a newly discovered 40K intermetallic MgB2 superconductor were prepared by high pressure sintering. Superconducting transition with the onset temperature of 39K was confirmed by both magnetic and resistive measurements. Magnetization versus field (M-H) curve shows the behavior of a typical Type II superconductor and the lower critical field Hc1(0) estimated from M-H curve is 0.032T. The bulk sample shows good connection between grains and critical current density Jc estimated from the magnetization hysteresis using sample size was 2x104A/cm2 at 20K and 1T. Upper critical field Hc2(0) determined by extrapolating the onset of resistive transition and assuming a dirty limit is 18T.

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