Low Frequency Electrodynamics of Correlated Metals

基本信息

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

项目摘要

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.***

9801816Gruner 在这项研究中，加州大学洛杉矶分校物理系的 G. Gruner 教授将研究一些重费米子化合物和有机导体在毫米波和微波区域的频谱在不同频率、温度和磁场条件下的行为场地。这些研究的目的是调查朗道费米液体理论的可能崩溃。先前对铂酸铀的实验得出的结果表明，对这种分解进行系统搜索是适当的。该主题当前引起高度关注，并且处于当代固体物理学研究的前沿。朗道理论在描述金属行为方面非常成功，但它可能不适用于以强相关电子-电子相互作用为特征的系统。这些被认为在表现出高温超导性、巨大磁阻等的系统中具有活性。因此，研究的目的是：检验重费米子金属金属态费米液体理论的有效性；确定重费米子绝缘体中相关间隙的性质；探索准一维金属中的各种量子态；并检查这些绝缘体中的 Mott-Luttinger 间隙。实验将在重费米子化合物CeAl3和CeRu2Si2等上进行。此外，还将对直链金属化合物（即所谓的 Bechgaard 盐）进行实验，以探索各向异性电动力学。这些实验的原因是认识到，对于具有电子-电子相互作用的严格一维金属，基态不是费米液体的基态，并且磁场可以改变系统的维数。实验将在高 Q 谐振结构中进行，其中样品构成结构的一部分。%%%这项研究将研究一些重费米子化合物和有机导体的行为。这些研究的目的是调查费米液体朗道理论的可能崩溃。该主题当前引起高度关注，并且处于当代固体物理学研究的前沿。该计划的一个重要特点是通过在基础和技术重要领域培训研究生来整合研究和教育。***