Transport properties and microstructure of mono- and seven-core wires of FeSe1-xTex superconductor by Fe-diffusion powder-in-tube method

Abstract

We report the successful fabrication of mono- and seven-core superconducting wires of FeSe1-xTex using an in-situ Fe-diffusion process based on the powder-in-tube (Fe-diffusion PIT) method. The reacted layer in these wires were found to have composite structure with composition nearly FeSe and FeTe for the inner and outer layers, although a single layer of composition FeSe0.5Te0.5 was supposed to be formed. The self-field transport Jc values at 4.2 K were found to be 226.2 A/cm2 and 100.3 A/cm2 respectively for mono- and seven-core wires. The Jc's of mono- and seven-core wires dropped rapidly at low fields and then showed a gradual decrease with increasing magnetic fields. In addition, the seven-core wire showed higher Jc than the mono-core wire under higher magnetic fields, indicating that the seven-core wire of FeSe1-xTex superconductor using Fe-diffusion PIT method is advantageous for the superconducting-wire application under high magnetic fields.

19 pages, 6 figures

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Cited by in corpus (8)

• Phase diagram and superconductivity at 58.1 K in α-FeAs free SmFeAsO1-xFx
• A new approach for improving global critical current density in Fe(Se0.5Te0.5) polycrystalline materials
• Thin Film Growth and Device Fabrication of Iron-Based Superconductors
• Transport properties of the single- and 3-core Fe-Se wires fabricated by a novel chemical-transformation PIT process
• Magneto-optical imaging and transport properties of FeSe superconducting tapes prepared by diffusion method
• Enhancement of superconducting properties in FeSe wires using a quenching technique
• Crystal structure instability of FeSe grains: Formation of non-superconducting phase at the grain surface
• α-FeAs-free SmFeAsO1-xFx by low temperature sintering with slow cooling