Neutron and X-Ray Scattering Studies of Disordered Magnets, Especially Lamellar Copper Oxides

无序磁体（尤其是层状氧化铜）的中子和 X 射线散射研究

• 批准号: 9315715
• 负责人: Robert Birgeneau
• 金额: --
• 依托单位: Massachusetts Institute of Technology
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-03-01 至 1997-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9315715&HistoricalAwards=false
• 关键词: Neutron; Ray; Scattering; Studies; Disordered

9315715 Birgeneau This experimental condensed matter physics project investigates (1) lamellar copper oxides, which form the basis of high temperature superconductors, and (2) model crystalline insulating magnets which are extremely disordered at the microscopic level. These interrelated materials represent problems which are at the frontiers of materials physics. For the copper oxides, understanding of both the normal and superconducting states is still remarkably primitive; while in the case of disordered magnets, sample history and irreproducibility of properties require an extension of existing understanding of equilibrium properties of materials. Neutron and x-ray diffraction will provide an atomic level picture of the magnetic properties, and how this picture changes as the structural length scale that is studied is increased. This research is of both fundamental and technical importance and may lead to production of new and higher quality superconducting and magnetic materials. %%% This experimental condensed matter physics project investigates (1) lamellar copper oxides, which form the basis of high temperature superconductors, and (2) model crystalline insulating magnets which are extremely disordered at the microscopic level. These interrelated materials represent problems which are at the frontiers of materials physics. For the copper oxides, understanding of both the normal and superconducting states is still remarkably primitive; while in the case of disordered magnets, sample history and irreproducibility of properties require an extension of existing understanding of equilibrium properties of materials. Neutron and x-ray diffraction will provide an atomic level picture of the magnetic properties, and how this picture changes as the structural length scale that is studied is increased. This research is of both fundamental and technical imp ortance and may lead to production of new and higher quality superconducting and magnetic materials. ***

9315715 Birgeneau 这个实验凝聚态物理项目研究 (1) 层状铜氧化物，它构成高温超导体的基础，以及 (2) 在微观水平上极其无序的晶体绝缘磁体模型。 这些相互关联的材料代表了材料物理学的前沿问题。 对于铜氧化物，对正常态和超导态的了解仍然非常原始。而在无序磁体的情况下，样本历史和特性的不可再现性需要扩展对材料平衡特性的现有理解。 中子和 X 射线衍射将提供磁性的原子级图像，以及该图像如何随着所研究的结构长度尺度的增加而变化。这项研究具有基础和技术重要性，可能会导致生产新的、更高质量的超导和磁性材料。 %%% 该实验凝聚态物理项目研究 (1) 层状铜氧化物，它构成高温超导体的基础，以及 (2) 在微观水平上极其无序的晶体绝缘磁体模型。 这些相互关联的材料代表了材料物理学的前沿问题。 对于铜氧化物，对正常态和超导态的了解仍然非常原始。而在无序磁体的情况下，样本历史和特性的不可再现性需要扩展对材料平衡特性的现有理解。 中子和 X 射线衍射将提供磁性的原子级图像，以及该图像如何随着所研究的结构长度尺度的增加而变化。这项研究具有基础性和技术重要性，可能会导致生产新的、更高质量的超导和磁性材料。 ***