Enhancement of in-field Jc in MgB2/Fe wire using single and multi-walled nanotubes

Details Enhancement of in-field Jc in MgB2/Fe wire using single and multi-walled nanotubes Enhancement of in-field Jc in MgB2/Fe wire using single and multi-walled nanotubes

2006-07-21

arxiv.org/abs/cond-mat/0607540v1

Physics

Condensed Matter

Superconductivity

18 pages, 4 figures, 2 tables. accepted by applied physics letters

Scientific paper

10.1063/1.2355467

We investigated the doping effects of SWCNTs and MWCNTs on the Tc, lattice parameters, Jc(B), microstructure, and Hc2 of MgB2/Fe wire. These effects systematically showed the following sequence for Tc and the a-axis: the SWCNT doped wire < the MWshortCNT doped wire < the MWlongCNT doped wire < un-doped wire, while Jc(B) followed the sequence of the SWCNT doped wire > the MWshortCNT doped wire > the MWlongCNT doped wire > un-doped wire. A dominating mechanism behind all these findings is the level of C substitution for B in the lattice. The best Jc(B) and Hc2 were obtained on SWCNT doped wire because the level of C substitution for B in this wire is higher than all others.

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