Electronic Properties of Electron-Doped Oxide Superconductors.

技术：该项目支持对电子掺杂高温超导体正常态特性的实验研究，主要使用各种传输技术。对正常态输运性质的理解有望从根本上理解高温超导的成因，高温超导是凝聚态物理中一个尚未解决的重大问题。与空穴掺杂的超导体相比，电子掺杂超导体的研究较少，它们的性质必须用任何最终的高温超导理论来解释。本项目中的实验将集中于研究量子临界行为作为掺杂、压力、温度和磁场的函数。这些实验有望阐明高T_c材料的量子临界性与超导电性的关系。该项目集研究和教育于一体，旨在培养学生和博士后研究人员掌握现代凝聚态物理实验技术。学生和博士后还将参与与其他机构的合作研究。此外，他们还将接受薄膜和单晶生长方法的培训，这些重要的研究技能在美国越来越稀缺。非技术：这个项目的重点是发现导致高温超导的关键因素，这是凝聚态物理中最重要的悬而未决的问题之一。对高温超导性的理解可能会让我们深入了解室温超导体的产生，这种材料将产生重大的技术和经济影响。这个项目的一个重要方面是使用一系列新的电传输技术来探测高温超导体的性质随参数的变化，如磁场、化学掺杂和压力。人们认为这些参数会导致高温超导体发生量子相变。与这种量子相变相关的特殊性质被认为是导致高温超导电性本身的原因，尽管具体是如何发生的还不清楚。该项目集研究和教育于一体，旨在培养学生和博士后研究人员掌握现代凝聚态物理实验技术。这些年轻的研究人员还将接受薄膜和晶体生长方法方面的培训，这是美国稀缺的重要研究技能。这些学员学到的所有技术都将为他们在学术界、国家实验室和工业领域的职业生涯做好准备。

Technical:This project supports an experimental investigation of the normal state properties of electron-doped high-temperature superconductors, primarily using a wide variety of transport techniques. An understanding of the normal state transport properties is expected to lead to a more fundamental understanding of the cause of high-temperature superconductivity, a major unsolved problem of condensed matter physics. The electron-doped superconductors are less well studied than their hole-doped counterparts and their properties must be explained by any final theory of high-Tc superconductivity. The experiments in this project will focus on a study of quantum critical behavior as a function of doping, pressure, temperature and magnetic field. It is hoped that the relationship between quantum criticality and superconductivity in the high-Tc materials will be elucidated by these experiments. This project integrates research and education in order to train students and postdoctoral researchers in modern condensed matter physics experimental techniques. The students and postdocs will also be involved in collaborative research with other institutions. Furthermore, they will be trained in thin film and single crystal growth methods, important research skills that are increasingly scarce in the United States.Non-Technical:This project is focused on discovering the key factors which cause high-temperature superconductivity, one of the most important unsolved problems of condensed matter physics. An understanding of high-temperature superconductivity may give insight into the creation of room temperature superconductors, materials that would have a significant technological and economic impact. An important aspect of this project is the use of a wide range of novel electrical transport techniques to probe the properties of high-temperature superconductors as a function of parameters, such as magnetic field, chemical doping, and pressure. It is thought that these parameters cause high-temperature superconductors to undergo a quantum phase transition. Special properties associated with this quantum phase transition are believed to cause the high-temperature superconductivity itself, although exactly how this happens is not understood. This project integrates research and education in order to train students and postdoctoral researchers in modern condensed matter physics experimental techniques. These young researchers will also be trained in thin film and crystal growth methods, important research skills that are scarce in the United States. All the techniques learned by these trainees will prepare them for careers in academe, national laboratories, and industry.