Publication Details

This article was originally published as: Dou, SX, Yeoh, WK, Horvat, J & Ionescu, M, Effect of carbon nanotube doping on critical current density of MgB2 superconductor, Applied Physics Letters, 2003, 83(24), 4996-4998, and may be found here. Copyright 2003 American Institute of Physics, This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.


The effect of doping MgB2 with carbon nanotubes on transition temperature, lattice parameters, critical current density and flux pinning was studied for MgB2–xCx with x = 0, 0.05, 0.1, 0.2, and 0.3. The carbon substitution for B was found to enhance Jc in magnetic fields but depress Tc. The depression of Tc, which is caused by the carbon substitution for B, increases with an increasing doping level, sintering temperature, and duration. By controlling the extent of the substitution and addition of carbon nanotubes we can achieve the optimal improvement on critical current density and flux pinning in magnetic fields while maintaining the minimum reduction in Tc. Under these conditions, Jc was enhanced by two orders of magnitude at 8 T and 5 K and 7 T and 10 K. Jc was more than 10 000 A/cm2 at 20 K and 4 T and 5 K and 8.5 T, respectively.

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