铁基超导体超导配对对称性角分辨光电子能谱研究

项目名称： 铁基超导体超导配对对称性角分辨光电子能谱研究

项目编号： No.11474340

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 数理科学和化学

项目作者： 钱天

作者单位： 中国科学院物理研究所

项目金额： 95万元

中文摘要： 铁基材料中的高温超导现象使之成为凝聚态物理和材料科学领域中的一个重要研究对象，其中具有丰富的物理内容。确定铁基超导配对对称性是检验各种配对理论模型，从微观上理解铁基超导电子配对起源的一个重要环节。利用实验室近期建设的极低温角分辨光电子能谱实验系统和上海光源超导能量分辨角分辨光电子能谱实验站，精确测量各类铁基超导体的超导能隙函数的动量依赖，结合其它实验手段，确定铁基超导配对对称性，揭示配对对称性和费米面拓扑结构、关联效应、轨道成分之间的联系，找出决定超导序参量对称性的关键因素，为理解铁基超导机理提供关键的实验数据。

中文关键词： 铁基超导体；电子结构；配对对称性

英文摘要： High-Tc superconductivity in iron-based compounds has become an important subject in condensed matter physics and materials science, which involves rich physical phenomena. Determine the superconducting pairing symmetry of the iron-based superconductors is an important step to examine various theoretical models on superconducting pairing and understand the microscopic origin of superconducting electron pairing. Using the ultralow temperature ARPES system and the high-resolution ARPES experiment stations in Shanghai Synchrotron constructed by our lab, we plan to measure accurately the superconducting energy gap function of lots of iron-based superconductors, combine with the results obtained by other experimental techniques, determine the superconducting pairing symmetry, reveal the relationship between the pairing symmetry and the Fermi surface topology, correlation effect, and orbital components, identify the key factors that determine the superconducting pairing symmetry, provide critical experimental data to understand the microscopic mechanism of superconductivity of iron-based compounds.

英文关键词： iron-based superconductor;electronic structure;pairing symmetry