Novel Electronic Properties of Unconventional Superconductors

非常规超导体的新颖电子特性

• 批准号: 1104256
• 负责人: richard greene
• 金额: $ 39.9万
• 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: 2011
• 资助国家: 美国
• 起止时间: 2011-08-01 至 2015-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1104256&HistoricalAwards=false
• 关键词: Novel; Electronic; Properties; Unconventional; Superconductors

****Technical Abstract****This project will pursue experiments to significantly advance the understanding of the origin of superconductivity in the high-Tc cuprate superconductors and the pairing symmetry of iron-based superconductors. The goal is to study and understand the low-temperature normal state properties of the electron-doped high-Tc superconductors and to use this new knowledge to impact the understanding of all the cuprates, hole- and electron-doped. The electron-doped cuprate research will be carried out via a variety of transport experiments in ambient magnetic field and in fields above the upper critical field down to milliKelvin temperatures. Some transport experiments will be done under hydrostatic pressure or strain. The iron-based superconductor research will be attempted via phase-sensitive Josephson tunneling experiments in a SQUID or corner junction arrangement, as proposed in several theoretical papers. An important goal of all these experiments is to understand the mechanism of superconductivity in these two classes of unconventional high-Tc materials, a major unsolved problem in condensed matter physics. A comparison of the normal state and superconducting properties of these two systems is expected to lead to new and important insights into the role of electronic correlations in high-Tc superconductors. This project will support the education of one postdoctoral fellow in the physics, materials science and measurement techniques necessary to carry out the proposed research. From past experience, this type of research has shown itself to be an excellent training for many scientific careers from academia to high technology industries.****Non-Technical Abstract****The cause of the high-temperature superconductivity found in some copper oxide and iron-based materials is one of the most important unsolved problems in condensed matter physics. These materials have great potential for use in energy related technologies, such as improved motors and electricity generation and transmission. It is crucial to understand the mechanism of superconductivity in these materials in order to develop the knowledge to discover new superconductors that will work at room temperature and above. This project will pursue experiments designed to solve this basic scientific question, and which may also help to develop useful technology. This will be accomplished by employing advanced transport measurement techniques, novel synthetic methods for making new materials and improved thin-film versions of known materials, and by using national laboratory facilities for measurements under extreme magnetic field and temperature conditions. This project will support the education of one postdoctoral fellow in the physics, materials science and measurement techniques necessary to carry out the proposed research. From past experience, this type of research has shown itself to be an excellent training for many scientific careers from academia to high technology industries. If room temperature superconductors can be discovered they will have a significant impact on many current technologies, from energy to communication.

****技术摘要****本项目将进行实验，以显著推进对高tc铜超导体超导性起源和铁基超导体配对对称性的理解。目标是研究和理解电子掺杂高tc超导体的低温正常状态特性，并利用这一新知识影响对所有铜酸盐，空穴和电子掺杂的理解。电子掺杂铜的研究将通过各种输运实验在环境磁场和在上临界场以上低至毫开尔文温度的场中进行。一些输运实验将在静水压力或应变下进行。铁基超导体的研究将尝试在SQUID或角结布置中通过相敏约瑟夫森隧道实验进行，正如几篇理论论文所提出的那样。所有这些实验的一个重要目标是了解这两类非常规高tc材料的超导机制，这是凝聚态物理中尚未解决的主要问题。这两种系统的正常状态和超导特性的比较有望导致对高tc超导体中电子相关作用的新的和重要的见解。该项目将支持一名博士后在物理学、材料科学和测量技术方面的教育，以开展拟议的研究。从过去的经验来看，这种类型的研究已经证明自己是从学术界到高科技行业的许多科学事业的良好培训。****非技术摘要****在一些氧化铜和铁基材料中发现的高温超导性的原因是凝聚态物理中最重要的未解决问题之一。这些材料在能源相关技术方面具有巨大的应用潜力，例如改进电机、发电和输电。了解这些材料的超导机制是至关重要的，这样才能开发出能够在室温及以上温度下工作的新型超导体。该项目将进行旨在解决这一基本科学问题的实验，这些实验也可能有助于开发有用的技术。这将通过采用先进的输运测量技术、制造新材料的新型合成方法和改进已知材料的薄膜版本，以及利用国家实验室设施在极端磁场和温度条件下进行测量来实现。该项目将支持一名博士后在物理学、材料科学和测量技术方面的教育，以开展拟议的研究。从过去的经验来看，这种类型的研究已经证明自己是从学术界到高科技行业的许多科学事业的良好培训。如果室温超导体能够被发现，它们将对当前从能源到通信的许多技术产生重大影响。