Improved superconducting properties in nanocrystalline bulk MgB2
By A. Gümbel, J. Eckert, G. Fuchs, K. Nenkov, K. Müller, L. Schultz. 2001
228 citations recorded by the source corpus.
High density nanocrystalline MgB2 bulk superconductors with distinctly improved pinning were prepared by mechanical alloying of Mg and B powders at ambient temperatures followed by hot pressing. The nanocrystalline samples reveal high jc=105 A/cm2 at 20 K and 1 T together with an irreversibility line strongly shifted towards higher fields resulting in Hirr(T)∼0.8 Hc2(T), whereas typically Hirr(T)∼0.5 Hc2(T) is observed for untextured bulk samples. These values exceed those of all other reported bulk samples and are in the range of values for thin films. The improved pinning of this material, which mainly consists of spherical grains about 40–100 nm in size, is attributed to the large number of grain boundaries in the nanocrystalline state.
Subfields: Condensed Matter Physics, Electronic, Optical and Magnetic Materials
View Paper: https://www.semanticscholar.org/paper/0e048dbb9cc229370393bbcac20c0af84cb0e579
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In Condensed Matter Physics
In Electronic, Optical and Magnetic Materials
Citations in the corpus
- Very high upper critical fields in MgB2 produced by selective tuning of impurity scattering (2003, background): “The same approach has been successfully applied to MgB2 as well, which was demonstrated by the alloying of MgB2 films [27], bulk samples [28], and also by proton [29] and neutron [30] irradiation of polycrystalline MgB2.”