Improved superconducting properties in nanocrystalline bulk MgB[sub 2]

Gu¨mbel, A.; Eckert, J.; Fuchs, G.; Nenkov, K.; Mu¨ller, K.-H.; Schultz, L.
April 2002
Applied Physics Letters;4/15/2002, Vol. 80 Issue 15, p2725
Academic Journal
High density nanocrystalline MgB[sub 2] 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 j[sub c]=10[sup 5] A/cm[sup 2] at 20 K and 1 T together with an irreversibility line strongly shifted towards higher fields resulting in H[sub irr](T)∼0.8 H[sub c2](T), whereas typically H[sub irr](T)∼0.5 H[sub c2](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. © 2002 American Institute of Physics.


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