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

我们开发了一种新的FeSe超导线材的制造工艺，利用线芯的结构转变。六角FeSe 1.2，起始线芯，被包装到Fe护套中。高温退火后，芯层与铁鞘层发生反应，由六方相FeSe 1.2转变为四方相FeSe。这种新颖的PIT方法使我们能够获得具有高密度芯的FeSe超导线材。此外，在这个项目中，我们发现了新的BiS2基层状超导体Bi4O4S3和REOBiS2系统。到目前为止，世界上已经发现了11种与BiS2基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.