Fabrication of Fe-based superconducting wires using effects ofstructural transformation and strain

我们利用线芯的结构变化，开发了制备FeSe超导线材的新工艺。起始线芯为六方FeSe1.2，填充在铁套中。通过高温退火，铁芯和铁鞘发生反应，从六方FeSe1.2转变为四方FeSe超导体。这种新颖的凹坑方法使我们能够获得高密度芯的FeSe超导线材。此外，在这个项目中，我们还发现了新的BiS2基层状超导体Bi4O4S3和REOBiS2系统。到目前为止，世界各地已经发现了11个与BIS2超导体有关的超导体。

We have developed novel fabrication process of FeSe superconducting wires using structural transformation of the wire core. The hexagonal FeSe1.2, starting wire core, was packed into the Fe sheath. By annealing at high temperature, the core and Fe sheath reacted and the transformation from hexagonal FeSe1.2 to tetragonal FeSe superconductor. This novel PIT method allowed us to obtain FeSe superconducting wires with high-density core. Furthermore, during this project, we have discovered new BiS2-based layered superconductor Bi4O4S3 and REOBiS2 systems. To date, 11 superconductors related to the BiS2-based superconductors have been discovered all over the world.