Abstract
Carbon nanotube-doped Fe-sheathed MgB 2 wires and tapes with different doping levels were fabricated by the in situ powder-in-tube method. The phases, microstructures and flux pinning were characterized by XRD, SEM/TEM, magnetic and transport-property measurements. It is found that carbon nanotubes (CNTs) doping resulted in a significant enhancement in the field dependence of critical current density J c for all the added wires and tapes. The J c in 13 T and 4.2 K for the CNTs doped tapes (optimal MgB 1.9C 0.1) increased by a factor of 11 compared to that of the undoped sample. The observed J c( B) improvement in the added samples is attributable to the enhanced flux pinning caused by the CNTs doping.
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