High Magnetic Field Probes of Electronic and Magnetic Structure in Low Dimensional and Correlated Electron Systems

低维及相关电子系统中电子和磁结构的强磁场探针

• 批准号: 9971474
• 负责人: James Brooks
• 金额: $ 31.5万
• 依托单位: Florida State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-08-01 至 2002-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9971474&HistoricalAwards=false
• 关键词: Magnetic; Field; Probes; Electronic; Structure

9971474BrooksThis experimental project addresses materials of central importance in condensed matter physics: anisotropic conductors and superconductors, correlated electronic metals, and magnetic nano-clusters. In all cases microscopic mechanisms are responsible for their ground state behavior, but many open questions about the nature of these ground states remain even after intense theoretical and experimental investigations. Prominent are incoherent or non-Fermi liquid transport with magnetic field orientation in low dimensional metals; the details of electronic structure which influence magnetic or superconducting ground states in intermetallic compounds; and the intra-cluster magnetic mechanisms in nano-magnets such as manganese acetate. In these investigations the unique capabilities of the National High Magnetic Field Laboratory will be utilized. Novel approaches to the determination of electronic structure will be implemented, thereby raising the utility of magneto-transport-based studies to a new level. In addition, studies of nano-magnetic clusters using nuclear decay methods will have a potential impact in the area of information storage at the quantum level. A strong commitment to education and public awareness in areas relevant to this research will be sustained, as will a high degree of international collaboration.%%%In electronic and magnetic materials, sometimes subtle details of their structure determine their macroscopic physical properties. Will the material be a magnet? A superconductor? An insulator? Such details lead to materials of scientific importance and with potential applications. This research project addresses experimentally several classes of materials central to condensed matter physics -anisotropic conductors and superconductors, correlated electronic metals, and magnetic nano-clusters. In all cases microscopic mechanisms are responsible for their most important physical properties. In these investigations the unique capabilities of the National High Magnetic Field Laboratory will be utilized, and a novel approach to the problem of electronic structure determination is proposed, which when implemented, will raise the utility of magnetoresistance-based studies for the characterization of materials to a new level. The magnetic studies too, have a potential impact in the area of information storage and processing at the quantum level, since intra-cluster switching mechanisms of the magnetization states in nano-magnets will be studied. A strong commitment is made to include educational outreach at all levels, and to provide outstanding graduate education opportunities which involve state-of-the-art instruments. Graduate students and post-doctoral associates are provided with training for a range of careers in industry, government and academe.

9971474 BrooksThis experimental project addresses materials of central importance in condensed matter physics：anisotropic conductors and superconductors，correlated electronic metals，and magnetic nano-clusters.这个实验项目解决了凝聚态物理学中至关重要的材料：各向异性导体和超导体，相关电子金属和磁性纳米簇。在所有的情况下，微观机制是负责他们的基态行为，但许多开放的问题，这些基态的性质仍然存在，即使在激烈的理论和实验研究。突出的是非相干或非费米液体输运与低维金属中的磁场取向;影响金属间化合物中的磁性或超导基态的电子结构的细节;以及纳米磁体（如醋酸锰）中的簇内磁性机制。在这些调查中，将利用国家高磁场实验室的独特能力。将实施确定电子结构的新方法，从而将基于磁输运的研究的效用提高到一个新的水平。此外，使用核衰变方法研究纳米磁性团簇将在量子水平的信息存储领域产生潜在影响。在与本研究相关的领域，将继续大力开展教育和提高公众意识，并将继续开展高度的国际合作。在电子和磁性材料中，有时其结构的细微细节决定了其宏观物理性质。材料是磁铁吗？超导体？绝缘体？这些细节导致材料的科学重要性和潜在的应用。该研究项目通过实验解决了凝聚态物理学的几类核心材料-各向异性导体和超导体，相关电子金属和磁性纳米簇。在所有情况下，微观机制负责其最重要的物理性质。在这些调查中，国家高磁场实验室的独特能力将被利用，并提出了一种新的方法来解决电子结构确定的问题，当实施时，将提高效用的磁阻为基础的研究材料的表征到一个新的水平。磁性研究也对量子水平的信息存储和处理领域产生潜在影响，因为将研究纳米磁体中磁化状态的团簇内切换机制。一个坚定的承诺，包括各级教育推广，并提供优秀的研究生教育机会，涉及国家的最先进的仪器。研究生和博士后助理提供了在工业，政府和企业的一系列职业培训。