Molecular Based Quantum Antiferromagnets: Design, Synthesis, and Experimental Investigations

这是一个固态化学和凝聚态物理组成部分的合作项目。新的材料将被合成，包含磁性原子阵列，它们在一维（链）或二维（层）中进行反铁磁相互作用。这些磁性材料被预测具有新颖的量子力学特性。例如，测量它们的磁性将为量子涨落效应的理论预测提供重要的检验。由于没有适当的材料，迄今无法进行这种试验。新材料的静态和动态磁性将通过磁化、磁化率和比热研究，以及核磁共振、EPR和中子散射实验来检验。人们正在设计和合成新的材料，以提供合适的1维和2维S=1/2反铁磁体。利用分子磁性原理，利用有机分子将过渡金属离子连接在适当的晶格中。新材料中的磁结构关系的研究将被强调，以帮助创造新一代的磁性材料。虽然重点是基本磁性，但结果可能对纳米技术或人工结构材料的一般领域感兴趣，其中原子可能被单独排列以提供技术应用的低维结构。这是一个与固态化学和凝聚态物理组成部分的合作项目。虽然单个原子的特性可以用量子力学的方法进行详细的分析，但我们要理解以不同几何形状连接在一起的大量原子是一项艰巨得多的任务。这个基础研究项目将研究磁性原子在一维（链）或二维（层）中相互作用的磁性系统的量子力学性质。在这样的几何中，量子力学做出了由于缺乏合适的材料而没有经过实验检验的新颖预测。这次合作设计并创造了新的磁性层和链，使用有机分子连接磁矩。该项目将为材料合成和表征领域的研究生提供优秀的培训。虽然研究的重点是基本磁学，但其结果可能对纳米技术或人工结构材料的一般领域感兴趣，在这些领域，原子可能被单独排列，为技术应用提供较低维度的结构。＊＊＊

9803813 Landee This is a collaborative project with solid state chemistry and condensed matter physics components. New materials will be synthesized which contain arrays of magnetic atoms which interact antiferromagnetically in one-dimension (chains) or two-dimensions (layers). These magnetic materials are predicted to have novel quantum mechanical properties. For example, measurements of their magnetic properties will provide important tests of theoretical predictions of the effects of quantum fluctuations. Such tests have not been possible to date because appropriate materials have not been available. Both the static and dynamic magnetic properties of the new materials will be examined via magnetization, susceptibility, and specific heat studies, as well as NMR, EPR, and neutron scattering experiments. New materials are being designed and synthesized to provide appropriate 1- and 2-dimensional S=1/2 antiferromagnets. The principles of molecular- based magnetism are employed to link transition metal ions together in the appropriate lattice using organic molecules. The study of the magneto-structural relationships in the new materials will be emphasized to aid in the creation of new generations of magnetic materials. While the focus is on fundamental magnetism the results are potentially of interest in the general are of nanotechnology or artificially structure materials where atoms might be individually arranged to provide lower dimension structures for technical applications. %%% This is a collaborative project with solid state chemistry and condensed matter physics components. While properties of individual atoms can be analyzed in some detail by the methods of quantum mechanics, our understanding a large numbers of atoms linked together in different geometries is a much more difficult task. This fundamental research project will study the quantum mechan ical properties of magnetic systems where magnetic atoms interact with each other in one-dimension (chains) or two- dimensions (layers). In such geometries, quantum mechanics makes novel predictions that have not been tested experimentally because of the lack of appropriate materials. This collaboration has designed and created new magnetic layers and chains using organic molecules to link magnetic moments. The project will provide excellent training of graduate students in the areas of materials synthesis and characterization. While the focus is on fundamental magnetism the results are potentially of interest in the general area of nanotechnology or artificially structure materials, where atoms might be individually arranged to provide lower dimension structures for technical applications. ***