NMR Studies of Pressure-Tuned Correlated Electron Systems

*非技术摘要*将研究选定电子系统中电子的竞争最低能态的物理，使用高压或通过略微改变化学成分来进行调整。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都很敏感。它可以应用于我们继续开发和扩展的各种极端条件下，包括低温、高压和尽可能广泛的应用磁场。主要的兴趣在于学习通过操纵获得的低温相的性质，以及是什么控制了一个相相对于另一个相的稳定性。该项目涉及多个阶段的研究人员，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，固体磁共振技术将被用来解决当前与选定的关联电子系统中的新的和竞争的基态有关的问题。这些材料分为两类，它们的微观物理性质截然不同：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有趣的各种相，包括与现有理论不一致的低温性质的类液体状态。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的实验技术。在这个项目的过程中，将对本科生、研究生和博士后级别的年轻科学家进行培训。

*** 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.