RUI: Probing Spin and Charge States in Electron-Correlated Materials by Nuclear Resonance

这是一个实验凝聚态物理项目，主要研究电子相关材料的本征非均质结构。该项目将通过磁和四极共振技术描述局部磁场和电场梯度分布的静态和动态特性。电子相关材料（系统中电子之间相互作用强烈，导致宏观行为完全不同于更常见的非相互作用电子系统，如普通金属）表现出丰富的行为，作为对温度和磁场变化的响应。这种行为的例子有超导性、磁性、反铁磁性、小矩和四极有序、非费米液体行为和巨磁阻。该项目的重点是阐明温度依赖的磁不均匀性在非费米液体材料和重费米子反铁磁体的固有行为中所起的作用，以及表征镍酸镧中的自旋和电荷结构（条纹）。为此，该项目将研究化学计量重费米子化合物和相关合金，以及富集61ni的La2-xSrxNiO4+d。通过该项目，将培养磁共振、射频电子学、低温学和计算机接口技术的本科生和研究生（硕士）。该项目将与加州大学河滨分校、佛罗里达大学和荷兰的卡默林在线实验室合作进行。这是一个实验凝聚态物理项目，专注于对电子相关材料的理解。在这些系统中，电子彼此之间强烈相互作用，导致的行为完全不同于更常见的非相互作用电子系统（如普通金属）所显示的行为。电子相关材料是目前科学技术领域非常关注的课题。从科学的角度来看，它们很有趣，因为它们对温度和磁场变化的反应表现出丰富的行为。从技术上讲，在这些系统中发现的特性，如超导性和巨大的磁阻，使它们成为未来应用的潜在候选者。该项目是国家和国际科学界对凝聚态物质研究更广泛努力的贡献。它将处理核共振技术的应用，以研究含有铀和铈的化合物（如所谓的重费米子系统）以及镍酸镧中的电子分布特性。重点是阐明在温度降低时这些材料中可能形成的固有非均匀结构所起的作用。通过该项目，将培养磁共振、射频电子学、低温学和计算机接口技术的本科生和研究生（硕士）。该项目将与加州大学河滨分校、佛罗里达大学和荷兰卡默林在线实验室合作开展

Bernal9820631This is an experimental condensed matter physics project that concentrates on the study of intrinsic inhomogeneous structures in electron-correlated materials. The project will characterize both static and dynamic properties of local magnetic-field and electric-field-gradient distributions by means of magnetic- and quadrupolar-resonance techniques. Electron-correlated materials (systems in which the electrons interact strongly with each other resulting in a macroscopic behavior completely different from that displayed by more common non-interacting electron systems, such as normal metals) display richness in behavior as a response to changes in temperature and magnetic field. Examples of such behavior are superconductivity, magnetism, antiferromagnetism, small-moment and quadrupolar ordering, non-Fermi-liquid behavior, and colossal magnetoresistance. The emphasis of the project is on elucidating the role-played by temperature-dependent magnetic inhomogenieties on the intrinsic behavior of non-Fermi-liquid materials and heavy-fermion antiferromagnets, and in characterizing spin and charge structures (stripes) in the lanthanum nickelates. To this end, the project will study stoichiometric heavy-fermion compounds and related alloys, and 61Ni-enriched La2-xSrxNiO4+d. Through the project, training will be achieved of undergraduate and graduate (masters level) students in the techniques of magnetic resonance, radio-frequency electronics, cryogenics, and computer interface. The project 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 is an experimental condensed matter physics project that concentrates on the understanding of electron-correlated 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. Electron-correlated materials are currently the subject of great deal of interest for science and technology. From the scientific point of view, they are interesting because of the richness in behavior they display in response to changes in temperature and magnetic field. Technologically, the properties that have been discovered in these systems, such as superconductivity, and colossal magnetoresistance, make them potential candidates for future applications. The project is a contribution to a wider effort of condensed matter research by the scientific community at the national and international levels. It will deal with the application of nuclear resonance techniques to study the properties of electron distributions in compounds containing uranium and cerium such as the so-called heavy-fermion systems as well as in the lanthanum nickelates. The emphasis is on elucidating the role played by intrinsic inhomogeneous structures that may be forming in these materials as the temperature is decreased. Through the project, training will be achieved of undergraduate and graduate (masters level) students in the techniques of magnetic resonance, radio-frequency electronics, cryogenics, and computer interface. The project will be carried out in collaboration with The University of California, Riverside, The University of Florida, and the Kamerlingh Onnes Lab in the Netherlands.***