Thermal and Dynamic Properties of Density Waves in Solids

固体中密度波的热学和动态特性

• 批准号: 9412612
• 负责人: Stuart Brown
• 金额: $ 24万
• 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: 1994
• 资助国家: 美国
• 起止时间: 1994-08-15 至 1998-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9412612&HistoricalAwards=false
• 关键词: Thermal; Dynamic; Properties; Density; Waves

9412612 Brown This is an experimental program to investigate the properties of correlated electrons systems. The program focuses on organic and inorganic conductors with incommensurate charge-density-wave and spin-density-wave instabilities. The objective is to discover the correlation between the fascinating transport and thermodynamic behavior with the elementary microscopic excitations. The program includes samples preparations and characterizations, and experiments conducted at the home institution and national user facilities such as the National High Magnetic Field Laboratory and the National Synchrotron Light Source. The present capabilities of the laboratory will be expanded. The materials preparation facility will be improved. Higher accuracy will be sought in transport and thermodynamic experiments under high pressure and in magnetic fields. Nuclear magnetic resonance experiments under high pressure will be performed. % % % % A large number of materials have high electrical conductivity like metals but only along specific crystallographic directions. Such materials are referred to as quasi-one-dimensional. They have specific physical properties different than the conventional metals. Electrons interacting with each other and with the lattice in such restricted dimensionality, are likely to form states of matter known as density waves (charge or spin) distinct from metals but with fascinating electrical and magnetic properties. This program is designed to investigate the correlation between the underlying microscopic interactions and the macroscopic properties such as electrical conductivity. The Principal Investigator will synthesize the materials and perform experiments in the department of physics at University of California at Los Angeles as well as at two national facilities, National High Magnetic field Laboratory and the National Synchrotron Light Source. ***

9412612布朗：这是一个研究关联电子系统性质的实验程序。该计划侧重于具有无公度电荷密度波和自旋密度波不稳定性的有机和无机导体。我们的目的是用基本的微观激发来发现吸引人的输运和热力学行为之间的关联。该计划包括样品的制备和表征，以及在国内机构和国家用户设施(如国家强磁场实验室和国家同步加速器光源)进行的实验。该实验室目前的能力将得到扩大。材料准备设施将得到改善。在高压和磁场下的输运和热力学实验中将寻求更高的精度。将进行高压下的核磁共振实验。许多材料像金属一样具有很高的导电性，但只沿着特定的晶体方向。这种材料被称为准一维材料。它们具有与传统金属不同的特殊物理性质。在这种受限的维度中，电子彼此相互作用，并与晶格相互作用，很可能形成被称为密度波(电荷或自旋)的物质状态，与金属不同，但具有迷人的电和磁性质。该程序旨在研究潜在的微观相互作用与宏观性质(如电导率)之间的相关性。首席研究员将在加州大学洛杉矶分校的物理系以及两个国家设施--国家强磁场实验室和国家同步加速器光源--合成材料并进行实验。***