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Applied Physics Letters / Volume 89 / Issue 12 / MAGNETISM AND SUPERCONDUCTIVITY

Appl. Phys. Lett. 89, 122510 (2006); doi:10.1063/1.2355467 (3 pages)

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

J. H. Kim1, W. K. Yeoh1, M. J. Qin1, X. Xu1, S. X. Dou1, P. Munroe2, H. Kumakura3, T. Nakane3, and C. H. Jiang3

1Institute for Superconducting and Electronic Materials, University of Wollongong, Northfields Avenue, Wollongong, New South Wales 2522, Australia
2Electron Microscopy Unit, University of New South Wales, Kensington, Sydney, New South Wales 2052, Australia
3Superconducting Materials Center, National Institute for Materials Science, 1-2-1, Sengen, Tsukuba, Ibaraki 305-0047, Japan

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(Received 9 March 2006; accepted 5 August 2006; published online 19 September 2006)

The authors investigated the doping effects of single-walled carbon nanotubes (SWCNTs) and multi-walled carbon nanotubes (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<undoped wire, while Jc(B) followed the sequence of the SWCNT doped wire>the MWshortCNT doped wire>the MWlongCNT doped wire>undoped wire. A dominating mechanism behind all these findings is the level of C substitution for B in the lattice.

© 2006 American Institute of Physics

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KEYWORDS and PACS

Keywords

iron, magnesium compounds, type II superconductors, carbon nanotubes, critical current density (superconductivity), lattice constants, superconducting transition temperature, superconducting critical field

PACS

  • 74.70.Ad

    Metals; alloys and binary compounds (including A15, MgB2, etc.)

  • 74.25.Sv

    Critical currents

  • 74.62.Dh

    Effects of crystal defects, doping and substitution

  • 74.25.Op

    Mixed states, critical fields, and surface sheaths

ARTICLE DATA

Permalink
http://link.aip.org/link/doi/10.1063/1.2355467

PUBLICATION DATA

ISSN:

0003-6951 (print)  
1077-3118 (online)

Publisher:

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
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