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Summary: Critical current behavior of superconducting MoN and Mo3Sb7 microfibers
A. B. Karki, D. P. Young, and P. W. Adams
Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
E. K. Okudzeto and Julia Y. Chan
Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA
Received 29 February 2008; published 10 June 2008
We present the transport and critical current measurements on carbon microfibers coated with 40-nm of
polycrystalline -MoN and on carbon microfibers coated with 160 nm of Mo3Sb7. In each case the coatings
where synthesized directly onto the 6- m diameter carbon fibers. The superconducting transition temperature
of the MoN microfibers was Tc 13.1 K, which is the highest temperature reported in any thin film form and
is higher than what was reported for stoichiometric -MoN, produced by high pressure synthesis. The transi-
tion temperature of the Mo3Sb7-coated microfibers Tc=7.5 K was significantly higher than that observed in
powder samples. Near the transition temperature Tc, the critical current density Jc for both systems was well
described by the power-law form 1- T/Tc
2
, where =1.5 is the GinzburgLandau exponent. We extrapo-
lated Jc 0 5 107
A/cm2
for the MoN microfibers and Jc 0 2.5 105
A/cm2
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