Enhancement of in-field Jc in MgB2 /Fe wire using single- and multiwalled carbon nanotubes

J. H. Kim, University of Wollongong
W. K. Yeoh, University of Wollongong
M. J. Qin, University of Wollongong
X. Xu, University of Wollongong
S. X. Dou, University of Wollongong

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This article was originally published as Kim, JH, Yeoh, WK, Qin, MJ, Xu, X, Dou, SX, Munroe, P, Kumakura, H, Nakane, T and Jiang, CH, Enhancement of in-field Jc in MgB2 /Fe wire using single- and multiwalled carbon nanotubes, Applied Physics Letters, 89(12), 2006, 122510-1-122510-3. Copyright American Institute of Physics 2006. Original journal article available here

Abstract

The authors investigated the doping effects of single-walled carbon nanotubes (SWCNTs) and multi-walled carbon nanotubes (MWCNTs) on the T_c, lattice parameters, J_c(B), microstructure, and H_c2 of MgB₂ /Fe wire. These effects systematically showed the following sequence for T_c and the α axis: the SWCNT doped wire<the >MW_shortCNT doped wire<the >MW_longCNT doped wire <undoped >wire, while J_c(B) followed the sequence of the SWCNT doped wire>the MW_shortCNT doped wire>the MW_longCNT doped wire>undoped wire. A dominating mechanism behind all these findings is the level of C substitution for B in the lattice.