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SiC and carbon nanotube distinctive effects on the superconducting properties of bulk MgB2

Journal Article


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Abstract


  • This work describes in detail the simultaneous enhancement of the upper critical field (Hc2) and the critical current density (Jc) of MgB2 bulk samples doped with nano-SiC particles, as well as single-walled and double-walled (dw) carbon nanotubes (CNTs). The magnetization properties were examined in a superconducting quantum interference device magnetometer, and four-probe transport measurements were performed using a 50 T pulsed magnet to determine Hc2(T). We found that the Jc enhancement is similar in all doped samples at 5 K but nano-SiC addition is more effective to improve the flux pinning in the high temperature range (T20 K); this improvement cannot solely be attributed to the C incorporation to the lattice but also to the presence of other types of defects (i.e., several kinds of nanoinclusions). CNTs produce a better C incorporation that is more effective to enhance Hc2 [i.e., dwCNT-doped samples reached a record Hc2(0)~44 T value for bulk MgB2]. All the Hc2(T) curves obtained for different types of doping can be successfully described using a model for a two-gap superconductor in the dirty limit. ÃÂÃÂÃÂé2008 American Institute of Physics

UOW Authors


  •   Serrano, G (external author)
  •   Serquis, A (external author)
  •   Dou, Shi
  •   Soltanian, Saeid (external author)
  •   Civale, L (external author)
  •   Maiorov, B (external author)
  •   Holesinger, T.G (external author)
  •   Balakirev, F (external author)
  •   Jaime, M (external author)

Publication Date


  • 2008

Citation


  • Serrano, G., Serquis, A., Dou, S. Xue., Soltanian, S., Civale, L., Maiorov, B., Holesinger, T. G., Balakirev, F. & Jaime, M. (2008). SiC and carbon nanotube distinctive effects on the superconducting properties of bulk MgB2. Journal of Applied Physics, 103 (2), 023907-1-023907-5.

Scopus Eid


  • 2-s2.0-38849135872

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=1471&context=engpapers

Ro Metadata Url


  • http://ro.uow.edu.au/engpapers/456

Start Page


  • 023907-1

End Page


  • 023907-5

Volume


  • 103

Issue


  • 2

Abstract


  • This work describes in detail the simultaneous enhancement of the upper critical field (Hc2) and the critical current density (Jc) of MgB2 bulk samples doped with nano-SiC particles, as well as single-walled and double-walled (dw) carbon nanotubes (CNTs). The magnetization properties were examined in a superconducting quantum interference device magnetometer, and four-probe transport measurements were performed using a 50 T pulsed magnet to determine Hc2(T). We found that the Jc enhancement is similar in all doped samples at 5 K but nano-SiC addition is more effective to improve the flux pinning in the high temperature range (T20 K); this improvement cannot solely be attributed to the C incorporation to the lattice but also to the presence of other types of defects (i.e., several kinds of nanoinclusions). CNTs produce a better C incorporation that is more effective to enhance Hc2 [i.e., dwCNT-doped samples reached a record Hc2(0)~44 T value for bulk MgB2]. All the Hc2(T) curves obtained for different types of doping can be successfully described using a model for a two-gap superconductor in the dirty limit. ÃÂÃÂÃÂé2008 American Institute of Physics

UOW Authors


  •   Serrano, G (external author)
  •   Serquis, A (external author)
  •   Dou, Shi
  •   Soltanian, Saeid (external author)
  •   Civale, L (external author)
  •   Maiorov, B (external author)
  •   Holesinger, T.G (external author)
  •   Balakirev, F (external author)
  •   Jaime, M (external author)

Publication Date


  • 2008

Citation


  • Serrano, G., Serquis, A., Dou, S. Xue., Soltanian, S., Civale, L., Maiorov, B., Holesinger, T. G., Balakirev, F. & Jaime, M. (2008). SiC and carbon nanotube distinctive effects on the superconducting properties of bulk MgB2. Journal of Applied Physics, 103 (2), 023907-1-023907-5.

Scopus Eid


  • 2-s2.0-38849135872

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=1471&context=engpapers

Ro Metadata Url


  • http://ro.uow.edu.au/engpapers/456

Start Page


  • 023907-1

End Page


  • 023907-5

Volume


  • 103

Issue


  • 2