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

这个实验凝聚态物理项目研究(1)形成高温超导体基础的层状铜氧化物，(2)在微观水平上极度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前沿的问题。对于铜氧化物，对正常和超导态的理解仍然非常原始；而在无序磁体的情况下，样品历史和性质的不可再现性需要扩展对材料平衡性质的现有理解。中子和x射线衍射将提供磁性的原子水平图像，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上的重要性，并可能导致新的和更高质量的超导和磁性材料的生产。这个实验凝聚态物理项目研究(1)层状铜氧化物，它是高温超导体的基础；(2)模型晶体绝缘磁体，它在微观水平上是极度无序的。这些相互关联的材料代表了材料物理学前沿的问题。对于铜氧化物，对正常和超导态的理解仍然非常原始；而在无序磁体的情况下，样品历史和性质的不可再现性需要扩展对材料平衡性质的现有理解。中子和x射线衍射将提供磁性的原子水平图像，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。这项研究具有重要的基础和技术意义，并可能导致新的和更高质量的超导和磁性材料的生产。＊＊＊

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. ***