Neutron scattering studies of spin dynamics in iron-based high-temperature superconductors

该奖项来自材料研究部凝聚态物理项目，支持一个研究产生新现象（如高转变温度超导性）的基本物理过程的项目。超导是一种现象，当某些材料冷却到特定的临界温度以下时，电阻为零，并产生磁场。对超导及其相关性质的理解不仅可以增强我们的基础科学知识，而且还可以使我们有能力设计具有新颖和可预测性质的材料。研究人员主要在橡树岭国家实验室的高通量同位素反应堆（HFIR）和散裂中子源（SNS）上进行中子散射实验。该项目还利用了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专家的培训，并阐明相关电子材料的特殊性质。技术摘要：该奖项来自材料研究部凝聚态物理项目，支持一个将中子散射实验与实验室材料工作相结合的实验项目，旨在从根本上理解铁基高转变温度超导体中自旋激发及其与超导性的关系。该项目的目的是探索和了解铁基超导体中各种相的微观起源，特别是砷化铁超导体BaFe2-xNixAs2， （B， K） Fe2A2和BaFe2As2-xPx。该程序有两个组成部分：初始材料表征和中子散射。这些材料的单晶在威廉·马什·莱斯大学生长，并将在那里进行初步表征。中子散射是本研究项目的核心部分，将用于研究这些材料的自旋动力学性质。实验将在橡树岭国家实验室和马里兰州NIST中子研究中心的高通量同位素反应堆和散裂中子源上进行。此外，当美国没有类似的能力时，欧洲其他世界级的中子散射设施也将被利用。这项研究计划的影响将包括下一代中子散射专家的培训，并阐明相关电子材料的特殊性质。

NON TECHNICAL ABSTRACTThis award from the Condensed Matter Physics program of the Division of Materials Research supports a project addressing the fundamental physical processes that give rise to novel phenomena such as high-transition temperature superconductivity. Superconductivity is a phenomenon of exactly zero electrical resistance and expulsion of magnetic fields occurring in certain materials when cooled below a characteristic critical temperature. Understanding of superconductivity and related properties will not only enhance our knowledge of basic science, but also gives us the ability to design materials with novel and predictable properties. The investigators conduct neutron scattering experiments performed mostly at the high-flux isotope reactor (HFIR) and Spallation Neutron Source (SNS) at the Oak Ridge National Laboratory. The project also utilizes 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 scattering experts and elucidating the nature of the special properties of the correlated electron materials.TECHNICAL ABSTRACTThis award from the Condensed Matter Physics program of the Division of Materials Research supports an experimental program integrating neutron scattering experiments with laboratory-based materials efforts, aimed at the fundamental understanding of spin excitations and their relationship with superconductivity in iron-based high-transition-temperature (high-Tc) superconductors. The objective of the project is to explore and understand the microscopic origins of various phases in iron-based superconductors, specifically the iron arsenide superconductors BaFe2-xNixAs2, (B, K) Fe2A2, and BaFe2As2-xPx. The program has two components: initial materials characterization and neutron scattering. Single crystals of these materials are grown at the William Marsh Rice University where the initial characterization of will be performed. Neutron scattering, the core part of this research program, will be used to study the spin dynamical properties of these materials. Experiments will be performed at the High-Flux Isotope Reactor and the Spallation Neutron Source at Oak Ridge National Laboratory and the NIST Center for Neutron Research in Maryland. In addition, other world-class neutron scattering facilities in Europe will also be utilized when similar capabilities are unavailable in the US. The impact of this research program will include the training of the next generation of neutron scattering experts and elucidating the nature of the special properties of the correlated electron materials.