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

铁基高温超导体自旋动力学的中子散射研究

• 批准号: 1362219
• 负责人: Pengcheng Dai
• 金额: $ 43.6万
• 依托单位: William Marsh Rice University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-07-15 至 2017-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1362219&HistoricalAwards=false
• 关键词: Neutron; scattering; studies; spin; dynamics

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.

非技术摘要该奖项来自材料研究部的凝聚态物理计划，支持一个解决引起高转变温度超导性等新现象的基本物理过程的项目。超导电性是一种当某些材料冷却到特征临界温度以下时，电阻恰好为零并且磁场排出的现象。 对超导性和相关性质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性质的材料。研究人员在橡树岭国家实验室的高通量同位素反应堆（HFIR）和SpO 2中子源（SNS）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。该研究计划的影响将包括培养下一代中子散射专家和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计划，支持将中子散射实验与实验室材料工作相结合的实验计划，目的是从根本上理解铁基高转变温度（高Tc）超导体中的自旋激发及其与超导性的关系。该项目的目标是探索和理解铁基超导体中各种相的微观起源，特别是砷化铁超导体BaFe 2-xNixAs 2，（B，K）Fe 2 A2和BaFe 2 As 2-xPx。该计划有两个组成部分：初始材料表征和中子散射。这些材料的单晶体在William Marsh Rice大学生长，在那里将进行初步表征。中子散射是该研究计划的核心部分，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SpO 2中子源中进行。此外，当美国没有类似的能力时，也将利用欧洲的其他世界级中子散射设施。该研究计划的影响将包括培训下一代中子散射专家，并阐明相关电子材料的特殊性质。