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.***

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不同频率、温度和磁场条件下在光谱的毫米和微波区域的行为。这些研究的目的是调查费米液体朗道理论的可能崩溃。以前对铀铂酸盐的实验结果表明，对这种分解进行系统研究将是合适的。这一课题具有很高的时代性，是当代固体物理学研究的前沿。朗道理论已经非常成功地描述了金属的行为，但它可能不适用于具有强关联电子-电子相互作用的系统。它们被认为在表现出高温超导、巨磁电阻和其他特性的系统中是活跃的。因此，这项研究的目的是：检验金属态与重费米子金属的费米液体理论的正确性；确定重费米子绝缘体中关联隙的性质；探索准一维金属中的各种量子态；以及检验这些绝缘体中的Mott-Luttinger带隙。这些实验将在重费米子化合物CeAl3和CeRu2Si2等上进行。此外，还将对线性链状金属化合物，即所谓的贝克加德盐进行实验，以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度。实验将在高Q共振结构中进行，其中样品是结构的一部分。本研究将研究一些重费米子化合物和有机导体的行为。这项研究的目的是研究费米液体朗道理论的可能崩溃。这一课题具有很高的时代性，是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一个重要的基础和技术领域对研究生进行培训，将研究和教育结合起来。