Neutron-scattering studies on magnetic correlations in FeAs-based superconductors

FeAs 基超导体中磁关联的中子散射研究

• 批准号: 237722335
• 负责人: Professor Dr. Markus Braden
• 金额: --
• 依托单位: Institut für Experimentalphysik
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2016-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/237722335?language=en
• 关键词: Neutron; scattering; studies; magnetic; correlations

With this proposal we would like to investigate several aspects of magnetic correlations in Fe-based superconductors by using advanced neutron scattering techniques and in particular by neutron polarisation analysis. The planned projects can be grouped into three parts: We would like to obtain a better understanding of the distribution of spin-density both in the paramagnetic and in the antiferromagnetic phases. Magnetic excitations seem to be a key element for the understanding of the superconducting pairing; we would like to deepen our knowledge by investigating the anisotropy of magnetic excitations in spin-space and by studying their detailed doping dependence. Pure and substituted LiFeAs would form a main focus of our activities due to the special character of this material which exhibits a high superconducting transition temperature without any doping.

通过这个提议，我们希望通过使用先进的中子散射技术，特别是通过中子极化分析来研究铁基超导体中磁关联的几个方面。计划的项目可以分为三个部分：我们希望更好地了解顺磁相和反铁磁相中自旋密度的分布。磁激发似乎是理解超导配对的关键要素。我们希望通过研究自旋空间中磁激发的各向异性并研究其详细的掺杂依赖性来加深我们的知识。纯 LiFeAs 和取代 LiFeAs 将成为我们活动的主要焦点，因为这种材料具有无需任何掺杂即可表现出高超导转变温度的特殊特性。