Intense vortex pinning enhanced by semicrystalline defect traps in self-aligned nanostructured MgB2

Li, S.; White, T.; Laursen, K.; Tan, T. T.; Sun, C. Q.; Dong, Z. L.; Li, Y.; Zho, S. H.; Horvat, J.; Dou, S. X.
July 2003
Applied Physics Letters;7/14/2003, Vol. 83 Issue 2, p314
Academic Journal
In this work, we report the discovery of a vortex pinning source: semicrystalline defect wells in self-aligned nanostructured MgB[SUB2]. It is demonstrated that these aperiodic regions trap numerous crystal defects migrating along nanodomain boundaries during self-alignment and act as intense vortex pinning centers that significantly enhance the high-field performance of MgB[SUB2]. This suggests that the density of trapped defects in the wells is much greater than that found in other vortex pinning sources.


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