Infrared Hall Effect in High Temperature Superconductors

高温超导体中的红外霍尔效应

• 批准号: 0070959
• 负责人: H. Dennis Drew
• 金额: $ 39.6万
• 依托单位: University of Maryland, College Park
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-09-01 至 2004-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0070959&HistoricalAwards=false
• 关键词: Infrared; Hall; Effect; Temperature; Superconductors

This project from an established professor at the University of Maryland consists of infrared (IR) and microwave magneto-optical studies of strongly correlated transition metal oxide metals, concentrating on the cuprate high temperature superconductors. Systematic investigations of the infrared Hall effect in thin film samples will be made using recently developed highly sensitive polarization modulation techniques to detect the small magneto-optical signals. The complex frequency-dependent magnetoconductivity tensor will be determined. In the studies in the normal state of high temperature superconductors the objectives are to expand on preliminary IR Hall data and past magneto-transport work that shows that the zero field response and the Hall response of these materials are governed by different relaxation processes. In the superconducting state the main goal is to provide the phenomenology that will allow an understanding of vortex dynamics in high Tc superconductors. The proposed studies break new ground in superconductivity research and they hold the promise of opening new paths for the science and technology of superconductors. They represent studies of the carrier dynamics in these materials which show anomalous non-Fermi liquid behavior. They cover the frequency range that corresponds to the important interaction energies in these materials. The results may provide important new insights into the mechanisms of high temperature superconductivity. The program involves the training of undergraduates, graduate students and post-docs in IR materials physics. %%%This project from an established professor at the University of Maryland consists of magneto-optical studies of materials with strongly interacting electrons, concentrating on the cuprate high temperature superconductors. The measurements will be made at high magnetic fields and cryogenic temperatures. The infrared (IR) Hall effect will be measured in thin film samples using recently developed highly sensitive infrared polarization modulation techniques. The studies probe the electrical properties of these materials that appear highly anomalous in comparison with traditional metals and superconductors. They break new ground in high temperature superconductivity research and they hold the promise of opening new paths for the science and technology of these materials. They cover the frequency range corresponding to the important interaction energies of the electrons in these materials. The results may provide important new insights into the mechanisms of high temperature superconductivity and in the understanding of materials with strongly interacting electrons in general. The program involves the training of undergraduates, graduate students and post-docs in IR materials physics. ***

该项目由马里兰大学的一位知名教授负责，包括对强相关过渡金属氧化物金属的红外（IR）和微波磁光研究，重点是铜高温超导体。系统地研究了薄膜样品中的红外霍尔效应，利用最近开发的高灵敏度偏振调制技术来检测微小的磁光信号。复频率相关的磁导张量将被确定。在高温超导体正常状态下的研究中，目标是扩展初步的红外霍尔数据和过去的磁输运工作，表明这些材料的零场响应和霍尔响应是由不同的弛豫过程控制的。在超导状态下，主要目标是提供现象学，使人们能够理解高温超导体中的涡流动力学。提出的研究在超导研究中开辟了新的领域，它们有望为超导体的科学和技术开辟新的道路。它们代表了这些材料中表现出异常非费米液体行为的载流子动力学的研究。它们覆盖了与这些材料中重要相互作用能相对应的频率范围。这些结果可能为高温超导的机理提供重要的新见解。本项目主要培养红外材料物理专业的本科生、研究生和博士后。这个项目来自马里兰大学的一位知名教授，包括对具有强相互作用电子的材料的磁光研究，重点是铜高温超导体。测量将在高磁场和低温下进行。红外（IR）霍尔效应将测量薄膜样品使用最近开发的高灵敏度红外偏振调制技术。这些研究探索了这些材料的电学特性，与传统金属和超导体相比，这些材料显得非常反常。他们在高温超导研究中开辟了新的领域，并有望为这些材料的科学和技术开辟新的道路。它们覆盖了与这些材料中电子的重要相互作用能相对应的频率范围。这些结果可能为高温超导的机理和对具有强相互作用电子的材料的理解提供重要的新见解。本项目主要培养红外材料物理专业的本科生、研究生和博士后。＊＊＊