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Improved superconducting properties in nanocrystalline bulk MgB_2

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arxiv cond-mat/0111585 v1 pith:UGILR22N submitted 2001-11-30 cond-mat.supr-con

A. Gümbel , J. Eckert , G. Fuchs , K. Nenkov , K.-H. Müller , L. Schultz This is my paper · ORCID
classification cond-mat.supr-con
keywords bulkimprovednanocrystallinesamplespinningvaluesalloyingambient
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Highly dense nanocrystalline MgB_2 bulk superconductors with distinctly improved pinning were prepared by mechanical alloying of Mg and B powders and hot compaction at ambient temperatures. The nanocrystalline samples reveal high critical current densities of 105 A/cm2 at 20 K and 1 T together with a strongly shifted irreversibility line towards higher fields resulting in H_irr(T) ~ 0.8 H_c2(T), whereas typically H_irr(T) ~ 0.5 H_c2(T) is observed for bulk untextured samples. These values exceed that of all other so far reported bulk samples and are in the range of the values of thin films. The improved pinning of this material which mainly consists of spherical grains of about 40-100 nm in size is attributed to the large number of grain boundaries.

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