RUI: Probing Hidden Order and Magnetic Disorder in Correlated Electron Systems Using Spin Probes

RUI：使用自旋探针探测相关电子系统中的隐藏有序和磁紊乱

• 批准号: 0203524
• 负责人: Oscar Bernal
• 金额: $ 18万
• 依托单位: California State L A University Auxiliary Services Inc.
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-07-15 至 2006-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0203524&HistoricalAwards=false
• 关键词: RUI; Probing; Hidden; Order; Magnetic

This individual investigator award will support an experimental project at a predominately undergraduate institution. The project concentrates on the study of intrinsic inhomogeneous structures in correlated electron materials, with a goal of elucidating the nature of phase transitions and the role played by disordered dynamics in the behavior of these systems as the temperature is decreased. Static and dynamic properties of local magnetic-field and electric-field-gradient distributions in systems undergoing phase transitions will be characterized by means of magnetic- and quadrupolar-resonance techniques. In addition, muon spin rotation techniques will be used to characterize and assess the role of disordered dynamics in the ground state of systems displaying characteristics consistent with a quantum critical point. Undergraduate and graduate (masters level) students working on this project will receive training in the techniques of magnetic resonance, radio-frequency electronics, cryogenics, and interfacing computers with experiments. The research will be carried out in collaboration with The University of California, Riverside, The University of Florida, and the Kamerlingh Onnes Lab in the Netherlands.This individual investigator award will support an experimental project at a predominately undergraduate institution. The project concentrates on increasing our understanding of correlated electron materials. These are systems in which the electrons interact strongly with each other, resulting in a behavior completely different from that displayed by the more common non-interacting electron systems such as normal metals. Correlated electron materials are currently the subject of great deal of interest for science and technology due to the wide variety of behaviors they display in response to changes in temperature and magnetic field. These materials may exhibit superconductivity, magnetism, antiferromagnetism, small-moment and quadrupolar ordering, non-Fermi liquid behavior, colossal magnetoresistance or hidden order. Nuclear-magnetic and quadrupolar-resonance and muon spin rotation techniques will be used to study the static and dynamic properties of correlated-electrons in rare-earth and actinide compounds such as heavy-fermion systems. The emphasis is on elucidating the nature of phase transitions and the role played by disordered dynamics in the behavior of these systems as the temperature is decreased. Undergraduate and graduate (masters level) students working on this project will receive training in the techniques of magnetic resonance, radio-frequency electronics, cryogenics, and interfacing computers with experiments. The research will be carried out in collaboration with The University of California, Riverside, The University of Florida, and the Kamerlingh Onnes Lab in the Netherlands.

这个个人研究者奖将支持一个实验项目，在一个主要的本科院校。 该项目专注于研究相关电子材料中的内在非均匀结构，目的是阐明相变的性质以及随着温度降低，无序动力学在这些系统行为中所起的作用。 将通过磁共振和四极共振技术来表征经历相变的系统中局部磁场和电场梯度分布的静态和动态特性。 此外，μ子自旋旋转技术将用于表征和评估无序动力学在显示与量子临界点一致的特性的系统的基态中的作用。 从事该项目的本科生和研究生（硕士）将接受磁共振、射频电子学、低温学和计算机与实验接口技术的培训。这项研究将与加州大学、滨江大学、佛罗里达大学和荷兰的Kamerlingh Onnes实验室合作进行。这项个人研究者奖将支持一个以本科为主的机构的实验项目。 该项目致力于增加我们对相关电子材料的理解。在这些系统中，电子彼此强烈相互作用，导致与更常见的非相互作用电子系统（如正常金属）所显示的行为完全不同的行为。 相关电子材料由于其在温度和磁场变化下表现出的各种行为而成为当前科学技术的热门课题。 这些材料可能表现出超导性、磁性、反铁磁性、小磁矩和四极有序、非费米液体行为、巨磁电阻或隐藏有序。 核磁共振、四极共振和μ子自旋旋转技术将用于研究稀土和锕系化合物（如重费米子系统）中相关电子的静态和动态性质。 重点是阐明相变的性质和无序动力学在这些系统的行为中所起的作用，随着温度的降低。 从事该项目的本科生和研究生（硕士）将接受磁共振、射频电子学、低温学和计算机与实验接口技术的培训。 这项研究将与加州大学、滨江大学、佛罗里达大学和荷兰的Kamerlingh Onnes实验室合作进行。