NMR Studies of Pressure-Tuned Correlated Electron Systems

压力调谐相关电子系统的核磁共振研究

• 批准号: 0520552
• 负责人: Stuart Brown
• 金额: --
• 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: 2005
• 资助国家: 美国
• 起止时间: 2005-07-15 至 2009-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0520552&HistoricalAwards=false
• 关键词: NMR; Studies; Pressure; Tuned; Correlated

*** NON-TECHNICAL ABSTRACT ***The physics of competing lowest energy states of electrons in selected electronic systems, tuned using high pressure or by varying slightly the chemical composition, will be examined. Magnetic resonance is the principal tool of our research, which is sensitive to the formation of inhomogeneous phases, as well as electron spin dynamics. It can be applied in a diverse set of extreme conditions that we continue to develop and expand on, including low temperatures, high pressures, and as wide a range of applied magnetic fields as is available. The principal interest is in learning of the nature of low-temperature phases accessed by the manipulation, and what controls the stability of one phase over another. The project involves researchers at many stages of their training, including undergraduate students, graduate students, and postdoctoral associates.*** TECHNICAL ABSTRACT ***In the course of this project, solid state magnetic resonance techniques will be employed to address current questions related to novel and competing ground states in selected correlated electron systems. The materials fall into two classes known for very different microscopic physics: itinerant ferromagnets and molecular conductors. In both cases, Coulomb interactions between charge carriers lead to an interesting variety of phases, including liquid-like states with low-temperature properties inconsistent with existing theories. These studies will lead to new scientific understandings of correlated matter, and new experimental techniques suitable for a broad range ofapplications. Young scientists, at the undergraduate, graduate, and postdoctoral levels, will be trained in the course of this project.

* 非技术性摘要 * 将研究在选定的电子系统中电子的竞争最低能量状态的物理学，使用高压或通过稍微改变化学成分进行调整。磁共振是我们研究的主要工具，它对非均匀相的形成以及电子自旋动力学敏感。它可以应用于各种极端条件，我们将继续开发和扩展，包括低温，高压和尽可能广泛的应用磁场。主要的兴趣是在学习的性质的低温阶段访问的操纵，以及什么控制的稳定性，一个阶段超过另一个。该项目涉及研究人员在他们的培训的许多阶段，包括本科生，研究生和博士后助理。技术摘要 * 在这个项目的过程中，固态磁共振技术将被用来解决目前的问题，在选定的相关电子系统的新的和竞争的基态。这些材料分为两类，以非常不同的微观物理学而闻名：巡回铁磁体和分子导体。在这两种情况下，电荷载流子之间的库仑相互作用导致了各种有趣的相，包括具有与现有理论不一致的低温性质的液体状态。这些研究将导致对相关物质的新的科学理解，以及适用于广泛应用的新实验技术。青年科学家，在本科生，研究生和博士后水平，将在这个项目的过程中进行培训。