Abstract
The Cu-doped MgB 2 bulks were prepared by a high-energy milling and subsequent sintering method. Compared to the pure and Cu-doped bulks prepared only by sintering, the critical current density ( J c ) of the milled Cu-doped samples was improved with a slight decrease in critical transition temperature ( T c ). Using the phase analysis and microstructure observation, it has been found that the MgB 2 grains in the milled Cu-doped sample was refined with the high-energy milling and thus provided more grain boundary pinning, which was contributed to the improvement of J c at high field.
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