U.S.-Japan Short-Term Visit: High -Tc Superconductors and other Spin-Gap Magnetic Systems

美日短期访问：高温超导体及其他自旋间隙磁系统

• 批准号: 0314058
• 负责人: Yasutomo Uemura
• 金额: $ 0.68万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-07-01 至 2004-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0314058&HistoricalAwards=false
• 关键词: U.S.; Japan; Short; Term; Visit

0314058UemuraThis award supports a three-month collaborative research project between Professor Yasutomo Uemura at Columbia University in New York and Professor Shin-ichi Uchida at the University of Tokyo in Japan. They will be undertaking research on High-Tc Superconductors and other Spin-gap Magnetic Systems. They will be collaborating on the muon spin relaxation, transport and optical measurements of high-Tc cuprate superconductors (HTSC). Muen spin relaxation is a powerful probe of magnetism and superconductivity. It is sensitive to spin fluctuations in a wide range of frequencies, and spin freezing of periodic/random/dilute spin configurations with an average ordered moment. It also provides volume-differential information for systems with coexisting regions with/without spin freezing. Magnetic field penetration depth of type-11 Superconductors can be determined accurately by muon spin relaxation. The collaborators will work on analyses of existing data. The experimental results will be compared to detailed computer simulation to estimate the volume fraction of the specimen subject to static spin freezing in high magnetic field. In addition to the effect of applied magnetic field as a single perturbation, they will also study what would happen when a high magnetic field is applied to systems which are already subject to other perturbations, such as Zn-doping or magnetic nano-island formation. The project brings together the efforts of two laboratories that have complementary expertise and research capabilities. The U.S. researcher provides expertise in the data analyses and interpretations and the Japanese collaborator is a world leader in optical and transport physics. Superconducting materials are fertile areas for research crucial to a number of applications areas such as the transmission of electricity, advanced electric motors, the storage of energy via flywheels, and advanced opto-electronic devices and sensors. Through the exchange of ideas and technology, this project will broaden our base of basic knowledge and promote international understanding and cooperation. Results of the research will be disseminated at scientific meetings and in scientific journals.

0314058Uemura 该奖项支持纽约哥伦比亚大学 Yasutomo Uemura 教授和日本东京大学 Shin-ichi Uchida 教授为期三个月的合作研究项目。 他们将开展高温超导体和其他自旋间隙磁系统的研究。 他们将在高温铜酸盐超导体（HTSC）的μ子自旋弛豫、输运和光学测量方面进行合作。 Muen 自旋弛豫是磁性和超导性的有力探针。 它对大范围频率的自旋波动以及具有平均有序矩的周期性/随机/稀释自旋构型的自旋冻结敏感。 它还为具有/不具有自旋冻结的共存区域的系统提供体积差异信息。 通过μ子自旋弛豫可以准确测定11型超导体的磁场穿透深度。 合作者将致力于分析现有数据。 实验结果将与详细的计算机模拟进行比较，以估计在高磁场中进行静态旋转冷冻的样本的体积分数。 除了施加磁场作为单一扰动的影响之外，他们还将研究当强磁场应用于已经受到其他扰动（例如锌掺杂或磁性纳米岛形成）的系统时会发生什么。 该项目汇集了两个具有互补专业知识和研究能力的实验室的努力。 美国研究人员提供数据分析和解释方面的专业知识，日本合作者是光学和传输物理学领域的世界领先者。 超导材料是研究的沃土，对于电力传输、先进电动机、通过飞轮储存能量以及先进光电设备和传感器等许多应用领域至关重要。 通过思想和技术的交流，该项目将拓宽我们的基础知识基础，促进国际理解与合作。 研究结果将在科学会议和科学期刊上传播。