压力下铁砷基化合物的超导电性研究

发布时间：2018-05-17 18:01

本文选题：高压 + 超导电性　；参考：《物理学报》2017年03期

【摘要】：随着高压实验设备与技术的不断发展,压力作为对物质状态调控的独立变量在凝聚态物理研究中得到了越来越广泛的应用.高压研究对发现新材料、新现象、新规律及对其形成机理的理解和对相关理论的验证起到了不可替代的重要作用,近年来在对铁基超导体超导电性的高压研究中取得的诸多重要研究进展充分说明了这一点.本文简要介绍了在压力下铁砷基超导体中呈现出的一些有趣的物理现象及其所反映出的物理内涵,例如,压力下对1111体系超导电性的研究在指导常压下用小离子半径元素替代获得最高超导转变温度的铁砷基超导体和推测铁砷基超导体超导转变温度上限等方面起到了重要作用;压力可抑制122体系母相的磁有序进而诱发超导电性,并揭示出Eu-122体系中Eu离子插层的磁有序与FeAs层超导电性的关系;在新型铁砷基超导体Ca_(0.73)La_(0.27)FeAs_2中发现的压致双临界点现象等.希望本文能对读者了解铁砷基超导体的高压研究进展情况有所帮助.
[Abstract]:With the continuous development of high pressure experimental equipment and technology, pressure as an independent variable to regulate the state of material has been widely used in condensed matter physics. High pressure research has played an important role in the discovery of new materials, new phenomena, new laws, understanding of its formation mechanism and verification of the theory of phase correlation. In recent years, many important advances in the study of the superconductor superconductivity of iron based superconductors have been fully explained. This paper briefly introduces some interesting physical phenomena presented in the iron arsenide superconductors under pressure and the physical meaning reflected, for example, the study of superconductivity of the 1111 system under pressure. Under the guidance of the normal pressure, it plays an important role in replacing the iron arsenical superconductor with the highest superconducting transition temperature by using the small ion radius element to replace the upper superconductor transition temperature upper limit of the superconductor. The pressure can inhibit the magnetic order of the mother phase of the 122 system and induce the superconductivity, and the magnetic properties of the Eu ion intercalation in the Eu-122 system are revealed. The relationship between the superconductivity of the sequence and the FeAs layer, the double critical point phenomenon found in the new type of iron arsenical superconductor Ca_ (0.73) La_ (0.27) FeAs_2, and so on. I hope this paper can help readers to understand the progress of the high pressure study of the iron arsenide superconductor.
【作者单位】：中国科学院物理研究所;中国科学院大学;
【基金】：国家自然科学基金(批准号:91321207,11427805) 中国科学院B类先导项目(批准号:XDB07020300) 国家重点研发计划(批准号:2016YFA0300300)资助的课题~~
【分类号】：O511.3;O521

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