NMR Investigation of Density Waves, Organic conductors, Superconductors, and Conducting Polymers

密度波、有机导体、超导体和导电聚合物的核磁共振研究

• 批准号: 0334869
• 负责人: W. Gilbert Clark
• 金额: $ 32.5万
• 依托单位: University of California-Los Angeles
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-10-15 至 2006-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0334869&HistoricalAwards=false
• 关键词: NMR; Investigation; Density; Waves; Organic

This individual investigator award supports a project whose main thrust is an experimental study of correlated electron systems and conducting polymers, mostly using nuclear magnetic resonance (NMR). NMR is a powerful tool to measure the static and dynamic properties of the magnetic field and charge configurations of a density wave, single electrons, band electrons, local electronic moments, or the vortex lattice in a superconductor. Topics to be studied include: (1) properties of the order parameters in the charge density wave system Rb(0.30)MoO(3); (2) unusual properties of the electron-doped cuprate superconductor Pr(1.85)Ce(0.15)CuO(4-y); (3) magnetic and electronic properties of the organic conductor lambda-(BETS)(2)FeCl(4), which has a paramagnetic metal phase, an antiferromagnetic insulating phase, and a field-induced superconducting phase; and (4) electron transport and dynamics in conducting polymers. These investigations will characterize the unusual properties of these systems, help to understand the way in which interactions determine these properties, and provide basic information that may be used in their technical applications. Important components of the work are the education of undergraduate students, graduate students, and postdoctoral researchers, and the development of advanced instrumentation and experimental techniques used for this work and made available to the broader scientific community. This individual investigator award supports a project whose primary thrust is an experimental study of materials in which interactions among many electrons lead to unusual physical properties. The main experimental tool to be used is nuclear magnetic resonance (NMR), which has proven to be very informative in such investigations. Systems to be studied include a high temperature superconductor, a two-dimensional organic conductor with very unusual properties, including a superconducting phase that is turned on by a very high magnetic field, and electrically conducting polymers that cover a wide range of conductivity from nearly insulating to metallic behavior. The value of these investigations is that they will characterize the unusual properties of these systems, help to understand the way in which interactions among electrons determine these properties, and provide basic information that may be used in their technical applications. Important components of the work include the education of undergraduate students, graduate students, and postdoctoral researchers, as well as the development of advanced instrumentation and experimental techniques used for this work and made available to the broader scientific community.

该个人研究者奖支持的项目主要是相关电子系统和导电聚合物的实验研究，主要使用核磁共振（NMR）。核磁共振是一种强大的工具，可以测量磁场的静态和动态特性，以及密度波、单电子、带电子、局部电子矩或超导体中旋涡晶格的电荷构型。研究课题包括：(1)电荷密度波体系Rb(0.30)MoO(3)的序参量性质；(2)电子掺杂铜超导体Pr(1.85)Ce(0.15)CuO（4-y）的异常性质；(3)有机导体lambda-(BETS)(2)FeCl(4)的磁性和电子性质，该有机导体具有顺磁性金属相、反铁磁性绝缘相和场致超导相；(4)导电聚合物中的电子传递和动力学。这些研究将描述这些系统的不寻常特性，有助于理解相互作用决定这些特性的方式，并提供可能用于其技术应用的基本信息。这项工作的重要组成部分是对本科生、研究生和博士后研究人员的教育，以及为这项工作开发先进的仪器和实验技术，并使其可供更广泛的科学界使用。这个个人研究者奖支持一个项目，该项目的主要推力是实验研究材料，其中许多电子之间的相互作用导致不寻常的物理性质。使用的主要实验工具是核磁共振（NMR），它已被证明在这类研究中非常有用。要研究的系统包括高温超导体，具有非常不寻常性质的二维有机导体，包括由非常高的磁场打开的超导相，以及涵盖从几乎绝缘到金属行为的广泛导电性的导电聚合物。这些研究的价值在于，它们将描述这些系统的不寻常性质，有助于理解电子之间的相互作用决定这些性质的方式，并提供可能用于其技术应用的基本信息。这项工作的重要组成部分包括对本科生、研究生和博士后研究人员的教育，以及为这项工作开发先进的仪器和实验技术，并使其可供更广泛的科学界使用。