Large transport Jc in Cu-sheathed Sr0.6K0.4Fe2As2 superconducting tape conductors
arXiv:1504.02219 · doi:10.1038/srep11506
Abstract
Copper sheath is the first choice for manufacturing high-Tc superconducting wires and tapes because of its high electrical and thermal conductivities, low cost and good mechanical properties. However, Cu can easily react with superconducting cores, such as BSCCO, MgB2 and pnictides, during high-temperature sintering process and therefore drastically decrease the transport Jc. Here, we report the fabrication of Cu-sheathed Sr1-xKxFe2As2 tapes with superior Jc performance using a simple hot pressing method that is capable of eliminating the lengthy high-temperature sintering required by conventional process. We obtained high-quality Sr1-xKxFe2As2 tapes with processing at 800oC for 30 minutes and measured high Tc and sharp transition. This rapid fabrication method can effectively thwart the diffusion of Cu into polycrystalline Sr-122 core. As a consequence, we achieved high transport Jc of 3.1x10^4 A/cm^2 in 10 T and 2.7x10^4 A/cm^2 in 14 T at 4.2 K. The in-field Jc performance is by far the highest reported for Cu-sheathed high-Tc conductors. Our results demonstrate the potential of Cu sheath for practical application of pnictide wires and tapes.
arXiv comment21 pages, 7 figures
References in corpus (15)
- Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
- Superconductivity at 43 K in Samarium-arsenide Oxides
- New Fe-based superconductors: properties relevant for applications
- Advantageous grain boundaries in iron pnictide superconductors
- Fishtail effect and the vortex phase diagram of single crystal Ba0.6K0.4Fe2As2
- Progress in wire fabrication of iron-based superconductors
- Very strong intrinsic supercurrent carrying ability and vortex avalanches in (Ba,K)Fe2As2 superconducting single crystals
- Realization of practical level current densities in Sr0.6K0.4Fe2As2 tape conductors for high-field applications
- Large transport critical currents of powder-in-tube Sr0.6K0.4Fe2As2/Ag superconducting wires and tapes
- Hot pressing to enhance the transport Jc of Sr0.6K0.4Fe2As2 superconducting tapes
- A new approach for improving global critical current density in Fe(Se0.5Te0.5) polycrystalline materials
- High transport Jc in magnetic fields up to 28 T of stainless steel/Ag double sheathed Ba122 tapes fabricated by scalable rolling process
- Strongly enhanced current densities in Sr0.6K0.4Fe2As2 superconducting tapes
- Improved transport critical currents in Ag and Pb co-doped BaxK1-xFe2As2 superconducting tapes
- Large enhancement of transport critical current density of ex-situ PIT Ag/(Ba,K)Fe2As2 tapes achieved by applying cycles of cold deformation and heat treatment