Investigation of the Low Temperature Normal State of Electron-Doped Copper Oxides

电子掺杂氧化铜低温常态的研究

• 批准号: 0352735
• 负责人: richard greene
• 金额: $ 37.5万
• 依托单位: University of Maryland, College Park
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-08-01 至 2007-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0352735&HistoricalAwards=false
• 关键词: Investigation; Low; Temperature; Normal; State

Understanding the mechanism of high-Tc superconductivity in the cuprates is one of the major unsolved problems of condensed matter physics. The main goal of this Individual Investigator Award is to gain a more detailed understanding of the normal state properties of the electron-doped high-Tc cuprates and to compare/relate these properties to the more studied hole-doped cuprates. A comprehensive set of experiments is proposed that will study the low temperature normal state when the superconductivity is suppressed by a magnetic field. An understanding of the properties of the low temperature normal state is expected to give crucial information for understanding the origin of high-Tc superconductivity. The broad ranges of experimental techniques to be used in this study are: anisotropic transport (i.e., resistivity, Hall effect, magnetoresistance, Nernst effect, thermopower, and thermal conductivity), specific heat, and tunneling. Collaborative experiments with other groups will use Raman scattering, IR optics, NMR, and muon spin resonance. The crystals and thin films needed for all of these experiments will be prepared and characterized by the PI. The broader impact of this program includes the training of undergraduate science majors, graduate students, and postdoctoral scientists in materials physics research, especially the methodology of thin film growth and characterization and transport measurements.Understanding the origin of high-temperature superconductivity (i.e., superconductivity at a temperature, Tc, above the boiling point of liquid nitrogen) is one of the major unsolved problems of physics. This Individual Investigator Award supports a project that addresses this problem by a comprehensive study of the electrical transport properties of a specially selected group of copper oxide high-Tc superconductors. The measurements will be made in high magnetic fields and at very low temperatures. The proposed studies will probe properties that are highly anomalous in comparison with conventional metals and superconductors. Therefore, the results of this study may provide important new insights into the mechanism of high-Tc superconductivity. These studies also hold the promise of opening new paths for the science and technology of these novel materials, and for other materials where strongly interacting electrons dominate the physics. This project also involves the training of undergraduate students, graduate students and postdoctoral scientists in materials physics, a field of great technological importance.

了解丘比特人中高-TC超导性的机制是凝结物理学的主要未解决问题之一。该单个研究者奖的主要目标是对电子掺杂的高-TC蛋糕的正常状态特性获得更详细的了解，并将这些特性与更研究的孔掺杂的蛋糕进行比较/将这些特性进行比较。提出了一组全面的实验，该实验将在磁场抑制超导性时研究低温正常状态。对低温正常状态的性质的理解有望提供至关重要的信息，以了解高-TC超导性的起源。这项研究中要使用的实验技术的广泛范围是：各向异性传输（即电阻率，霍尔效应，磁磁性，Nernst效应，热电器和导热率），特定的热量和隧道。与其他小组的协作实验将使用拉曼散射，IR光学，NMR和MUON自旋共振。所有这些实验所需的晶体和薄膜将由PI准备和表征。 The broader impact of this program includes the training of undergraduate science majors, graduate students, and postdoctoral scientists in materials physics research, especially the methodology of thin film growth and characterization and transport measurements.Understanding the origin of high-temperature superconductivity (i.e., superconductivity at a temperature, Tc, above the boiling point of liquid nitrogen) is one of the major unsolved problems of physics.该单独的研究者奖支持一个通过对一组特殊选择的氧化铜高-TC超导体的电气传输特性的全面研究来解决此问题的项目。测量值将在高磁场和非常低的温度下进行。拟议的研究将探测与常规金属和超导体相比高度异常的特性。因此，这项研究的结果可能会为高-TC超导性机理提供重要的新见解。这些研究也有望为这些新型材料的科学和技术开辟新的道路，以及其他相互作用电子占主导地位的材料。该项目还涉及对材料物理学的本科生，研究生和博士后科学家的培训，这是一个非常重要的领域。