“111”型铁基超导材料研究进展

Research progress about “111”-typed iron based superconductor

"111"型铁基超导体系包含LiFeAs,NaFeAs和LiFeP三个组员.这三个组员的晶体结构简单,具有非极性解离面等特点,在铁基超导物理机理研究中发挥着独特的作用.本文简要介绍"111"型铁基超导体的研究进展.

＂111＂-typed iron based superconductors have three members： LiFeAs, NaFeAs and LiFeP. The family of LiFeAs itself does not show any long range magnetic order but become superconductor without chemical doping. NaFeAs displays the separation of structural and magnetic transition, suitable to investigate the origin of the two transitions.LiFeP has been proved to be a nodal superconductor. The structure of ＂111＂, compounds consists of [FeAs/P] layers intercalated with two alkali metal layers, which makes single crystals easy to be cleaved into two equal counterparts with non-polar surface and thus is favored by the surface characterization techniques, such as the research of angleresolved photoemission experiment and scanning tunneling microscope measurement. Up to now, fruitful results have been achieved about the study of ＂111＂ family. In this paper, we summarize recent progresses on this family.