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

基于分子的量子反铁磁体：设计、合成和实验研究

• 批准号: 9803813
• 负责人: Christopher Landee
• 金额: $ 36万
• 依托单位: Clark University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-07-15 至 2003-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9803813&HistoricalAwards=false
• 关键词: Molecular; Based; Quantum; Antiferromagnets; Design

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. ***

9803813兰迪这是一个与固态化学和凝聚态物理组件合作的项目。将合成一维(链)或二维(层)反铁磁相互作用的磁性原子阵列的新材料。这些磁性材料被预测具有新的量子力学性质。例如，对它们的磁性的测量将为量子涨落效应的理论预测提供重要的测试。到目前为止，由于还没有合适的材料，这样的测试是不可能的。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、电子顺磁共振和中子散射实验来检验。人们正在设计和合成新的材料，以提供合适的一维和二维S=1/2反铁磁体。基于分子的磁性原理是利用有机分子在适当的晶格中将过渡金属离子连接在一起。将重点研究新材料中的磁-结构关系，以帮助创造新一代的磁性材料。虽然重点放在基本磁性上，但结果可能对一般的纳米技术或人工结构材料感兴趣，在这些材料中，原子可能被单独排列，为技术应用提供较低维度的结构。%这是一个与固态化学和凝聚态物理组件合作的项目。虽然单个原子的性质可以通过量子力学的方法进行更详细的分析，但我们理解以不同几何形式链接在一起的大量原子是一项困难得多的任务。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。在这样的几何结构中，量子力学做出了新的预测，但由于缺乏合适的材料，这些预测还没有经过实验测试。这种合作设计和创造了新的磁层和磁链，使用有机分子连接磁矩。该项目将在材料合成和表征领域为研究生提供出色的培训。虽然重点放在基本磁性上，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。***