Japan JSPS Program: NMR Studies of Low-Dimensional Correlated Electron Systems

Recchia 9724757该奖项支持日本科学促进会(JSPS)为Charles Recchia博士在日本东京大学设立的为期24个月的博士后奖学金。雷奇亚博士将与固态物理研究所物理学教授高川雅志博士合作开展一项名为“低维关联电子系统的核磁共振研究”的研究项目。计划中的研究将集中在利用核磁共振来探索与高温超导体相关的一类新材料。这些被称为“梯形化合物”的新材料可能会为研究人员提供重要线索，了解导致奇异超导电性的机制。确定了高温超导体中的关键结构元素是铜和氧的二维面。放置在铜原子上的电子自旋会引起短程磁序耦合，这是一种基本的波动，被认为是超导的关键。关于这种电子耦合的详细性质以及它如何产生超导电性，仍然存在争议。为了解决这些问题，研究人员目前正在研究含有铜和氧的有限宽度“梯子”的样品，但理想超导活动的有限宽度尚不清楚。这项研究的主要目标是利用核磁共振技术的最新进展来确定这些“梯子”的理想宽度，从而提供对新型低维材料中电子耦合过程的更深层次的理解。***

Recchia 9724757 This award supports a 24 month Japan Society for the Promotion of Science (JSPS) Postdoctoral Fellowship for Dr. Charles Recchia at the University of Tokyo, Tokyo,Japan. Dr. Recchia will work with Dr. Masashi Takigawa, Professor of Physics at the Institute of Solid State Physics, on a research project entitled, "NMR Studies of LowDimensional Correlated Electron Systems." The proposed research will focus on the use of nuclear magnetic resonance (NMR) to probe a new class of materials related to hightemperature superconductors. These new materials, known as "ladder compounds," may provide researchers with important clues as to the mechanisms that are responsible for exotic superconductivity. It is determined that the crucial structural elements in high temperature superconductors are two dimensional planes of copper and oxygen. Electronic spins placed on copper atoms causes a short-range magnetic order coupling, a basic fluctuation that is thought to be the key to superconductivity. Controversy remains regarding the detailed nature of this electronic coupling and how it gives rise to superconductivity. In an effort to resolve these issues, researchers are now investigating samples that contain finite width "ladders" of copper and oxygen, but the finite width appropriate to ideal superconductive activity remains unclear. The primary goal of the research is to use recent advances in NMR techniques to identify the idealwidth of these "ladders" and, thus, provide a far deeper understanding of the electronic coupling process in novel lowdimensional materials. ***