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.

该单独的研究者奖支持一个项目，其主要推力是对相关电子系统和进行聚合物的实验研究，主要是使用核磁共振（NMR）。 NMR是测量密度波，单电子，带电子，局部电子力矩或超导体中磁场的静态和动态特性的强大工具。要研究的主题包括：（1）电荷密度波系统RB（0.30）MOO（3）中的顺序参数的属性； （2）电子掺杂的库酸酯超导体PR（1.85）CE（0.15）CuO（4-Y）的异常特性； （3）有机导体lambda-（BETS）（2）FECL（4）的磁性和电子特性，该（2）具有顺磁金属相，抗磁性绝缘阶段和场诱导的超导相； （4）导电聚合物中的电子传输和动力学。这些调查将表征这些系统的异常属性，有助于了解交互确定这些属性的方式，并提供可能在其技术应用中使用的基本信息。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，以及用于这项工作的先进仪器和实验技术的开发，并提供给更广泛的科学界。该个人研究者奖支持一个项目，其主要推力是对材料的实验研究，其中许多电子之间的相互作用导致了异常的物理特性。要使用的主要实验工具是核磁共振（NMR），事实证明，在此类研究中，它非常有用。要研究的系统包括高温超导体，这是具有非常不寻常特性的二维有机导体，包括一个由非常高的磁场打开的超导相，以及电动导电聚合物，涵盖了从几乎绝缘的电导率范围金属行为。这些调查的价值在于它们将表征这些系统的异常属性，有助于了解电子之间的相互作用确定这些属性的方式，并提供可能在其技术应用中使用的基本信息。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，以及用于这项工作的先进仪器和实验技术的开发，并提供给更广泛的科学界。