Effects of ball-mill processing on the superconductivity of sucrose doped MgB2
Good critical current density, Jc(H), performance is found in sucrose doped MgB2 samples produced by both ball-milling and hand milling. It has been found that the Jc of the ball-milled doped MgB2 sample was 7.0 × 103 A cm−2 at 5 K and 8 T, which is more than two times higher than for hand-milled doped MgB2 and a factor of 70 higher than for the pure reference sample made from as-supplied amorphous boron powder. Significant improvement in Jc at high fields is attributed to the upper critical field, Hc2, enhancement caused by the increased disorder.
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