Critical current behavior of superconducting MoN and Mo3Sb7 microfibers

Abstract

We present the transport and critical current measurements on carbon microfibers coated with 40-nm of polycrystalline δ-MoN and on carbon microfibers coated with 160 nm of Mo3Sb7. In each case the coatings where synthesized directly onto the 6−μm 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 δ-MoN, produced by high pressure synthesis. The transition 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]α, where α=1.5 is the Ginzburg–Landau exponent. We extrapolated Jc(0)≈5×107 A/cm2 for the MoN microfibers and Jc(0)≈2.5×105 A/cm2 for the Mo3Sb7 fibers.

Source-reported materials — not catalogue approval

Similar papers