The production of critical current density (Jc) by 20-30 nm diameter columnar grains of MgB2 was analyzed. It was observed that 20-30 nm diameter columnar grain structure produced Jc exceeding 5×106 A/cm2. It was also observed that strongest pinning ocurred when the field was aligned parallel to the grain boundaries. The results show that grain boundaries in MgB2 do not obstruct current flow as in the high-temperature cuprate superconductors, but act like those in intermetallic superconductors such as Nb3Sn.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)