122体系铁基超导单晶的制备及其化学掺杂研究进展

Research Progress on Fabrication and Chemical Doping of 122-type Iron-based Single Crystal Superconductors

制备铁基超导体122体系的高质量、大尺寸单晶较为容易,对于研究铁基超导机理有重要的意义。122铁砷超导体母相没有超导性,进行化学掺杂在体系中引入电子、空穴或加化学压力,可诱导出超导性。本文总结了助熔剂法、布里奇曼法和光学浮区法等几种122体系铁基超导单晶的制备方法,并介绍了相关方法和研究进展。本文还概述了电子掺杂、空穴掺杂、等价掺杂等几种122铁砷超导体的化学掺杂以及相关研究进展。

The discovery of iron-based superconductors has offered a new material family for explor-ing the mechanism of high-temperature superconductivity.122-type iron-based superconductors has been widely studied by various researchers due to the easy fabrication for the parent compounds of 122-type iron arsenic matrix of high-quality single crystals of large-size.However,which do not intrinsically ex-hibit superconductivity.Generally,superconductivity is induced through chemical doping to introduce elec-trons,holes or chemical pressure in these compounds.This paper summarizes several fabrication methods on the single crystals of 122-type iron-based superconductors,including the flux method,Bridgman method,and optical floating zone method.The related research progress of these crystal growth methods are also reviewed.Besides,the recent rsearch progress related with chemical dopingof 122 iron arsenic superconductors,such aselectron doping,hole doping and isovalent doping etc.is also summerized.