IR Hall Effect in the Pseudogap State of the Cuprates

铜酸盐赝能隙状态下的红外霍尔效应

• 批准号: 0303112
• 负责人: H. Dennis Drew
• 金额: --
• 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: 2003
• 资助国家: 美国
• 起止时间: 2003-09-01 至 2008-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0303112&HistoricalAwards=false
• 关键词: IR; Hall; Effect; Pseudogap; State

This individual investigator award will support continued infrared magneto-transport studies of cuprate high temperature superconductors in order to elucidate the anomalous transport observed in these materials. The emphasis will be on the pseudogap state of the underdoped cuprates. Measurements of the infrared Hall effect in thin single crystal samples will be made over the frequency range corresponding to the important interaction energies. These measurements will use the highly sensitive polarization modulation technique developed by the PI. The magneto-transport data will be critically compared with the data from Angular Resolved Photoemission experiments on the same materials. In the superconducting state the goal is to provide the phenomenology that will allow an understanding of vortex dynamics in high Tc superconductors both below and possibly above Tc in the pseudogap state. The proposed studies will break new ground in superconductivity research and they hold the promise of opening new paths for the science and technology of superconductors. The broader impact of this program includes the development of novel measurement techniques for materials science and the training of high school students, undergraduate science majors, graduate students and post docs in infrared materials physics. Magneto-optical measurements of metals with strongly interacting electrons, mostly the cuprate high temperature superconductors, will be performed at infrared frequencies. The measurements will be made in high magnetic fields and at cryogenic temperatures. The proposed studies probe the electrical transport properties of the cuprates, which appear highly anomalous in comparison with conventional metals and superconductors. The measurements cover the frequency range corresponding to the important interaction energies of the electrons. 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. They also hold the promise of opening new paths for the science and technology of these novel materials. The techniques developed in this program are novel and may be used in other laboratories. The project also involves the training of undergraduate students, graduate students and post docs in materials physics. In addition, new teaching demonstrations of materials science in magnetic fields will be developed.

该个人研究者奖将支持铜高温超导体的红外磁输运研究，以阐明在这些材料中观察到的异常输运。重点将放在欠掺杂铜酸盐的赝隙态上。薄单晶样品中红外霍尔效应的测量将在与重要相互作用能相对应的频率范围内进行。这些测量将使用PI开发的高灵敏度偏振调制技术。磁输运数据将与相同材料的角分辨光电发射实验数据进行严格比较。在超导状态下，目标是提供现象学，使人们能够理解高Tc超导体在赝隙状态下的涡旋动力学，既低于Tc，也可能高于Tc。提出的研究将在超导研究中开辟新的领域，它们有望为超导体的科学和技术开辟新的道路。该计划的广泛影响包括材料科学新测量技术的发展，以及红外材料物理的高中生、本科生、研究生和博士后的培训。磁光测量具有强相互作用电子的金属，主要是铜高温超导体，将在红外频率下进行。测量将在高磁场和低温下进行。提出的研究探讨了铜酸盐的电输运性质，与传统金属和超导体相比，铜酸盐的电输运性质显得非常反常。测量覆盖了与电子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。它们还有望为这些新材料的科学和技术开辟新的道路。在这个程序中开发的技术是新颖的，可以在其他实验室使用。本项目还涉及材料物理专业本科生、研究生和博士后的培养。此外，还将开发新的磁场材料科学教学示范。