通知公告

(6.16)学术报告: Local Probe of Electron Correlation Effect and Superconductivity in the Iron-based High-temperature Superconductors

报告人: 于伟强 教授 (中国人民大学)
报告题目: Local Probe of Electron Correlation Effect and Superconductivity in the Iron-based High-temperature Superconductors
报告时间: 2013年6月16日(周日)上午9:00
报告地点: 强磁场中心技术装备厅201会议室
报告摘要:
      The iron-based superconductors have attracted a lot of attention because of its high-temperature superconductivity and as well the rich physics from its complex band and magnetic structures. In this talk, I will report our usage of NMR as a local probe to study the various orders, the dynamic properties, and their prominent correlation effect in the iron-based superconductors.
      I will first present our recent work in establishing singlet pairin, two types of spin fluctuations, and microscopic coexistence of antiferromagnetism and superconductivity in several important iron-based superconductors, which are crucial for clarifying these materials with a magnetic origin of superconductivity. I will also report our recent high-pressure NMR measurements on an overdoped iron pnictide, where a spontaneous lattice optimization of spin fluctuations and superconductivity under pressure is observed for the first time. These studies give important information for understanding the electron correlation effect and the paring mechanism in the iron-based superconductors.
报告人简介:
        于伟强, 1996年和1999年分别在北京师范大学物理系获得本科和硕士学位,2004年在美国加州大学洛杉矶分校(UCLA)物理系获得凝聚态物理博士。2004-2008年在美国马里兰大学(UMD)超导研究中心和加拿大麦克马斯特(McMaster)大学物理系进行博士后研究工作。2008年回国,在中国人民大学物理系任教授。在人民大学主要开展凝聚态核磁共振技术和输运测量,并结合低温高压条件,专注于量子磁性和超导材料的物性实验研究。尤其是近几年来,使用自主搭建的低温、高压凝聚态核磁共振系统,在铁基超导材料的磁性、自旋涨落和超导性质等方面做出多项国际前沿研究。目前共发表40多篇论文,包括Phys. Rev. Lett.,JACS和Adv. Mater.等9篇,论文总引用1200余次。

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