Transport properties and microstructure of mono- and seven-core wires of FeSe1 − x Te x superconductor produced by the Fe-diffusion powder-in-tube method
Abstract:We report the successful fabrication of mono- and seven-core superconducting wires of FeSe1 − x Te x using an in situ Fe-diffusion process based on the powder-in-tube (Fe-diffusion PIT) method. The reacted layers in these wires were found to have composite structure with the 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 J c values at 4.2 K were found to be 226.2 A cm − 2 and 100.3 A cm − 2 respectively for mono- and seven-core wires. The J cs of these wires dropped rapidly at low fields and then showed a gradual decrease with increasing magnetic fields. In addition, the seven-core wire showed higher J c than the mono-core wire under higher magnetic fields, indicating that the seven-core wire of FeSe1 − x Te x superconductor produced using the Fe-diffusion PIT method is advantageous for superconducting wire applications under high magnetic fields.
Document Type: Research Article
Publication date: October 1, 2011