新型铁基超导体材料的研究进展  

Recent developments of novel Fe-based superconductors

作　　者：郭建刚[1] 金士锋[1] 王刚[1] 王顺冲[1] 朱开兴[1] 周婷婷[1] 赖晓芳[1] 贺蒙[2] 陈小龙[1] 

机构地区：[1]中国科学院物理研究所北京凝聚态物理国家实验室功能晶体研究与应用中心,北京100190 [2]国家纳米科学中心,北京100190

出　　处：《物理》2011年第8期510-515,共6页Physics

基　　金：国家自然科学基金(批准号:90922037;51072226)资助项目

摘　　要：文章主要介绍了碱金属插层法合成新型铁基超导体的研究进展.通过采用碱金属K对FeSe层状材料插层的方法,得到了一种新型的铁基超导体K0.8Fe1.7Se2,并对该材料的晶体结构与物性进行了研究.结果表明,该化合物的超导转变温度达到30K,这是FeSe体系在常压下的最高超导转变温度.同时,观察到该体系中存在转变温度为43K的超导相,但未得到纯相.通过磁性元素Co的掺杂研究,进一步加深了对K0.8Fe1.7Se2体系超导演化规律的认识.该超导体的发现对深入认识铁基超导体的超导机理,探索具有更高超导转变温度的铁基超导体具有重要意义.This paper presents recent progress in the study of novel Fe-based superconductors. We report a new Fe-based superconductor K0.8Fe1.7Se2, which was synthesized by intercalating the alkali-metal K into FeSe layers. Its superconducting transition temperature is 30K, which is the highest value at ambient pressure among the FeSe-based materials. Meanwhile, a superconducting phase with a transition temperature of 43K also emerges in this system, but the effort to make a pure sample composed of this 43K phase has not yet been successful. Furthermore, the effect of magnetic Co-doping on the superconductiing behavior is also reported. The results may have important implications for understanding the superconducting mechanism and exploring these new Fe-based superconductors.

关 键 词：层状化合物 碱金属插层 铁基超导材料 

分 类 号：O511[理学—低温物理]