IR Hall Effect in the Pseudogap State of the Cuprates

这一个人研究人员奖将支持对铜酸盐高温超导体的持续红外磁输运研究，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伪隙状态上。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。磁输运数据将与在相同材料上的角分辨光电发射实验的数据进行关键的比较。在超导态中，我们的目标是提供一种现象学，使我们能够理解处于伪隙状态的高T_c超导体中的涡旋动力学，包括T_c以下和可能高于T_c。拟议中的研究将在超导研究方面开辟新的天地，它们有望为超导体的科学和技术开辟新的道路。该计划的更广泛影响包括开发材料科学的新测量技术，以及培训高中生、本科生、研究生和博士后红外材料物理。具有强相互作用电子的金属，主要是铜酸盐高温超导体，将在红外频率下进行磁光测量。测量将在强磁场和低温下进行。拟议的研究探索了铜酸盐的电输运性质，与传统金属和超导体相比，铜酸盐看起来非常反常。这些测量覆盖了与重要的电子相互作用能相对应的频率范围。这些结果可能会对高温超导的机制以及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。该项目开发的技术是新颖的，可以在其他实验室使用。该项目还涉及材料物理本科生、研究生和博士后的培训。此外，还将开发新的材料科学在磁场中的教学演示。

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.