Influence of Cu addition on microstructure and transport properties in MgB/sub 2/ tapes

Stainless steel sheathed MgB/sub 2/ tapes with Cu addition were fabricated by PIT method. The influence of Cu content on microstructure and the critical-current density (J/sub c/) of the tapes has been studied. The J/sub c/ value of MgB/sub 2/ tapes was increased from 1500 A/cm/sup 2/ to 4500 A/cm/sup 2/ at 4.2 K and 5 T due to Cu addition. J/sub c/-B curves show enhancement in J/sub c/(B), which suggests that the microstructure and transport properties of MgB/sub 2/ have been improved with Cu addition.