铁基超导体材料和物理研究  

Iron-Based Superconducting Materials and Pairing Mechanism

作　　者：闻海虎[1] 

机构地区：[1]南京大学物理学院,江苏南京210093

出　　处：《中国材料进展》2015年第1期73-78,共6页Materials China

基　　金：国家自然科学基金委(11034011/A0402);科技部973计划项目(2011CBA00102;2012CB821403);高校985计划项目资助

摘　　要：自2008年初在铁砷/铁卤(FeAs/FeSe)基材料中发现高温超导电性以来,已经有至少7种结构类型的材料被合成出来了。其中在"1111"体系中,电阻和磁化测量得到的超导转变温度可达56 K,而且有迹象表明超导转变温度有可能会继续升高。在铁基超导体的正常态,有很多非常规电子特性,如反铁磁性和四方-正交结构相变等也被观察到。铁基超导体是典型的多带超导体,具有较长的相干长度、近三维的电子特性、很高的上临界磁场及不可逆磁场和很强的磁通钉扎能力等物理性质,因此它们在强磁场方面有很好的应用前景。简单综述了铁基超导材料的结构类型,针对几种主要结构类型的性质进行了描述,对电子配对的机理问题作了比较详尽的阐述,结合临界电流和临界磁场行为,展望了铁基超导体的应用前景。Since the discovery of high temperature superconductivity in the iron pnictide/ chalcogenide materials, at least seven related structural types have been fabricated. In the 1111 system, the highest superconducting transition temperature （Tc） measured by resistivity and magnetization can reach 56 K. There are some hints that the To can be increased to higher values. The iron-based superconductors have multiband feature. Many unconventional electronic properties in the normal state of iron-based superconductors have been discovered. The iron based superconductors have relatively longer coherence length, more three dimensional electronic property, higher upper critical field and irreversibility field, very strong flux pinning, therefore they have the great potential for applications for producing high magnetic field. In this short overview, we will give a brief survey about the development of materials and physics of iron-based superconductors. We give detailed descriptions on the properties for several kinds of materials with the major structures. In addition, we will give an introduction about the present understanding of the pairing mechanism. Finally we will try to give a perspective on the potential applications of the iron-based superconductors.

关 键 词：铁基超导体 材料结构类型 电子配对机制 应用展望 

分 类 号：TM26[一般工业技术—材料科学与工程]