Neutron scattering studies of spin and lattice dynamics in electron-doped high-temperature superconductors and layered manganese oxides

电子掺杂高温超导体和层状氧化锰中自旋和晶格动力学的中子散射研究

• 批准号: 0756568
• 负责人: Pengcheng Dai
• 金额: $ 34.5万
• 依托单位: University of Tennessee Knoxville
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-05-01 至 2011-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0756568&HistoricalAwards=false
• 关键词: Neutron; scattering; studies; spin; lattice

NONTECHNICAL ABSTRACTThis NSF project addresses the fundamental physical processes that give rise to novel collective phenomena and self-assembled nano-structures. The materials known to exhibit these collective phenomena are the strongly correlated electron transition metal oxides (TMOs). 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 TMOs such as electron-doped high-transition-temperature (high-Tc) superconductors and layered manganese oxides. The objective of the program is to explore and understand the microscopic origins of various phases in the TMOs using neutron as a probe. Neutron scattering experiments will be performed mostly at the newly upgraded high-flux isotope reactor (HFIR) 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. 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 TMOs.TECHNICAL ABSTRACTThis NSF project addresses the dominant new scientific theme of our time, the fundamental and practical importance of understanding complex, self-organizing behavior exhibited in transition metal oxides (TMOs). The objective of this research program is to explore and understand the microscopic origins of various phases in the TMOs using neutron scattering as a primary tool. Specially, the project will focus on electron-doped high-transition temperature (high-Tc) superconductors and layered colossal magneto-resistance (CMR) manganese-oxides. For high-Tc superconductors, the project will investigate the nature of the interplay between magnetism and superconductivity. For CMR manganese-oxides, the project will focus on understanding how the microscopic spin/lattice dynamics determine the bulk magnetic and transport properties of these materials. Neutron scattering experiments, the core part of this research program, will be performed mostly at the newly upgraded high-flux isotope reactor (HFIR) 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. 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 TMOs.

这个NSF项目致力于研究产生新的集体现象和自组装纳米结构的基本物理过程。已知的呈现这些集体现象的材料是强关联电子过渡金属氧化物(TMOS)。对这些现象的理解不仅将提高我们的基础科学知识，还将使我们有能力设计出具有新颖和可预测性能的材料。具体地说，该实验计划将中子散射实验与基于实验室的材料工作相结合，旨在基本了解TMO中的自旋和晶格激发，如电子掺杂的高温超导体和层状锰氧化物。该计划的目标是利用中子作为探测器来探索和了解TMOS中各种相的微观起源。中子散射实验将主要在橡树岭国家实验室新升级的高通量同位素反应堆(HFIR)进行。然而，当HFIR没有类似的能力时，该项目也将利用美国和欧洲的其他世界级设施。这项研究计划的影响将包括培训下一代中子散射者和阐明TMO奇异性质的性质。技术摘要这个NSF项目解决了当今占主导地位的新科学主题，了解过渡金属氧化物(TMO)中复杂的自组织行为的基本和实际重要性。该研究计划的目的是以中子散射为主要工具，探索和了解TMOS中各相的微观起源。特别是，该项目将专注于电子掺杂的高转变温度(高温)超导体和层状巨磁阻(CMR)锰氧化物。对于高温超导体，该项目将研究磁性和超导电性之间相互作用的性质。对于CMR锰氧化物，该项目将侧重于了解微观自旋/晶格动力学如何决定这些材料的体磁和输运性质。作为这项研究计划的核心部分，中子散射实验将主要在橡树岭国家实验室(ORNL)新升级的高通量同位素反应堆(HFIR)进行。然而，当HFIR没有类似的能力时，该项目也将利用美国和欧洲的其他世界级设施。这项研究计划的影响将包括培训下一代中子散射者，并阐明TMO奇异特性的性质。