Low Frequency Electrodynamics of Correlated Metals

相关金属的低频电动力学

• 批准号: 9801816
• 负责人: George Gruner
• 金额: $ 34.5万
• 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: 1998
• 资助国家: 美国
• 起止时间: 1998-11-01 至 2001-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9801816&HistoricalAwards=false
• 关键词: Low; Frequency; Electrodynamics; Correlated; Metals

9801816GrunerIn this research Professor G. Gruner of the Department of Physics of the University of California at Los Angeles will investigate the behavior of some heavy fermion compounds and organic conductors in the millimeter and microwave regions of the spectrum under varying conditions of frequency, temperature and magnetic field. The purpose of these studies is to investigate the possible breakdown of the Landau theory of fermi liquids. Previous experiments on uranium platinate gave results that suggest that a systematic search for such breakdown would be appropriate. This topic is of high current interest and stands at the forefront of contemporary research in solid state physics. The Landau theory has been very successful in describing the behavior of metals but it may not apply to systems characterized by strongly correlated electron-electron interactions. These are believed to active in systems that exhibit high-temperature superconductivity, colossal magnetoresistance, and others. The objectives of theresearch are therefore: to test the validity of the Fermi liquid theory of the metallic state with heavy fermion metals; to determine the nature of the correlation gap in heavy fermion insulators; to explore the various quantum states in quasi one-dimensional metals; and to examine the Mott-Luttinger gap in these insulators. The experiments will be done on the heavy fermion compounds CeAl3 and CeRu2Si2, and others. Also, experiments will be performed on linear chain metal compounds, the so-called Bechgaard salts, to explore the anisotropic electrodynamics. Here the reason for these experiments is the recognition that for strictly one-dimensional metals with electron-electron interactions, the ground state is not that of a Fermi liquid and that a magnetic field can change the dimensionality of the system. The experiments will be performed with high Q resonant structures in which the samples form part of the structure.%%%This research will investigate the behavior of some heavy fermion compounds and organic conductors. The purpose of thses studies is to investigate the possible breakdown of the Landau theory of fermi liquids. This topic is of high current interest and stands at the forefront of contemporary research in solid state physics. An important feature of the program is the integration of research and education through training of graduate students in a fundamentally and technologically important area.***

9801816 Gruner在这项研究中，G.位于洛杉矶的加州大学物理系的Gruner将研究一些重费米子化合物和有机导体在不同频率、温度和磁场条件下在毫米和微波频段的行为。 这些研究的目的是调查费米液体的朗道理论的可能崩溃。 先前对铀铂酸盐的实验结果表明， 的 有系统地研究这种分类是适当的。这个主题是当前的高度兴趣，并站在当代研究的最前沿，在固态物理。朗道理论在描述金属的行为方面非常成功，但它可能不适用于具有以下特征的系统： 强关联的电子-电子相互作用。 这些被认为是活跃的系统，表现出高温 超导性， 巨大的磁阻和其他的。 因此，本研究的目的是：检验重费米子金属金属态的费米液体理论的有效性;确定重费米子绝缘体中关联能隙的性质;探索准一维金属中的各种量子态;并研究这些绝缘体中的Mott-Luttinger能隙。 实验将在重费米子化合物CeAl 3和CeRu 2 Si 2等上进行。 此外，实验将进行线性链金属化合物，所谓的Bechgaard盐，探索各向异性电动力学。 在这里，这些实验的原因是认识到，对于严格的 一维金属 电子-电子相互作用，基态不是费米液体，磁场可以改变系统的维度。 实验将使用高Q谐振结构进行，其中样品形成结构的一部分。%本研究将探讨一些重费米子化合物和有机导体的行为。 这些研究的目的是探讨费米液体的朗道理论的可能崩溃。 这个主题是当前的高度兴趣，并站在当代研究的最前沿，在固态物理。 该计划的一个重要特点是通过在一个基础和技术重要领域培养研究生来整合研究和教育。