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.

非技术摘要这一奖学材料研究部的奖项奖支持了一个针对基本物理过程的项目，这些过程引起了新型现象，例如高转移温度超导性。超导性是一种完全零电阻的现象和在特征临界温度以下冷却时，在某些材料中发生的磁场的驱动。 了解超导性和相关特性不仅会增强我们对基础科学的了解，而且还使我们能够使用新颖和可预测的特性来设计材料。研究人员进行的中子散射实验主要是在橡树岭国家实验室的高速通量同位素反应器（HFIR）和散布中子源（SNS）上进行的。 当HFIR和SNS无法使用类似功能时，该项目还利用了美国和欧洲的其他世界一流的设施。该研究计划的影响将包括培训下一代中子散射专家的培训，并阐明相关电子材料的特殊特性的性质。技术摘要材料研究的凝聚力物理学计划的奖项支持一个实验计划，将中性散射与实验室材料的努力相结合的实验计划，旨在与实验室材料的努力相结合，旨在与实验室材料的努力相结合，旨在与基础材料的关系，旨在涉及奇特的关系。高过渡 - 温度（高-TC）超导体。该项目的目的是探索和理解铁基超导体中各个阶段的微观起源，特别是铁砷氧化铁超导体BAFE2-XNIXAS2，（B，K）FE2A2和BAFE2AS2AS2-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·马什赖斯大学（William Marsh Rice University）生长，在那里将进行最初的特征。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旋转动力学特性。实验将在橡树岭国家实验室和马里兰州NIST中子研究中心的高速速同位素反应堆和散布中子源进行。此外，当美国无法获得类似的能力时，欧洲其他世界一流的中子散射设施也将被利用。该研究计划的影响将包括对下一代中子散射专家的培训，并阐明相关电子材料的特殊特性的性质。