Neutron Scattering Studies of Spin and Lattice Dynamics in Electron-Doped Iron and Copper-Based High-Temperature Superconductors

技术摘要本研究计划的目的是探索和理解铁和铜基超导体中高转变温度（高Tc）超导性的微观起源，使用中子散射作为主要工具。特别是，该项目将集中在电子掺杂的铁和铜基高温超导体。我们将研究磁性和超导性之间相互作用的本质。中子散射实验是该研究计划的核心部分，主要在橡树岭国家实验室（ORNL）的高通量同位素反应堆（HFIR）和SpO2中子源（SNS）上进行。然而，该项目还将利用美国和欧洲的其他世界级设施，而HFIR和SNS没有类似的能力。该研究计划的影响将包括下一代中子散射的训练和阐明这些高Tc超导体的奇异性质的性质。非技术摘要NSF的这个项目解决了引起新的集体现象，如高转变温度超导的基本物理过程。已知表现出这些集体现象的材料是强关联电子材料。对这些现象的理解不仅会增强我们的基础科学知识，而且会使我们有能力设计具有新颖和可预测特性的材料。具体而言，该实验计划将中子散射实验与实验室材料工作相结合，旨在对基于铁和铜的电子掺杂高转变温度（高Tc）超导体中的自旋和晶格激发进行基本了解。该计划的目的是探索和理解铁和铜高温超导体的各个阶段的微观起源，使用中子作为探针。中子散射实验将主要在橡树岭国家实验室的高通量同位素反应堆（HFIR）和SpO2中子源（SNS）上进行。然而，该项目还将利用美国和欧洲的其他世界级设施，而HFIR和SNS没有类似的能力。这项研究计划的影响将包括下一代中子散射的训练和阐明相关电子材料的奇异性质的性质。

Technical AbstractThe objective of this research program is to explore and understand the microscopic origin of high-transition-temperature (high-Tc) superconductivity in iron and copper based superconductors using neutron scattering as a primary tool. Specially, the project will focus on electron-doped iron and copper based high-Tc superconductors. We will investigate the nature of the interplay between magnetism and superconductivity. Neutron scattering experiments, the core part of this research program, will be performed mostly at the high-flux isotope reactor (HFIR) and Spallation Neutron Source (SNS) at the Oak Ridge National Laboratory (ORNL). However, the project will also utilize other world-class facilities in the U.S. and Europe when similar capabilities are unavailable at HFIR and SNS. The impact of this research program will include the training of the next generation of neutron scatters and elucidating the nature of the exotic properties of these high-Tc superconductors.Non-Technical AbstractThis NSF project addresses the fundamental physical processes that give rise to novel collective phenomena such as high-transition temperature superconductivity. The materials known to exhibit these collective phenomena are the strongly correlated electron materials. The understanding of these phenomena will not only enhance our knowledge of basic science, but also gives us the ability to design materials with novel and predictable properties. Specifically, the experimental program integrates neutron scattering experiments with lab based materials efforts, aimed at the fundamental understanding of the spin and lattice excitations in electron-doped high-transition-temperature (high-Tc) superconductors based on iron and copper. The objective of the program is to explore and understand the microscopic origins of various phases of iron and copper high-Tc superconductors using neutron as a probe. Neutron scattering experiments will be performed mostly at the high-flux isotope reactor (HFIR) and Spallation Neutron Source (SNS) at the Oak Ridge National Laboratory. However, the project will also utilize other world-class facilities in the U.S. and Europe when similar capabilities are unavailable at HFIR and SNS. The impact of this research program will include the training of the next generation of neutron scatters and elucidating the nature of the exotic properties of the correlated electron materials.