U.S.-Brazil Science Program: Dynamics of Spin and Charge Fluctuations in High Temperature Superconductors and RelatedSystems

美国-巴西科学项目：高温超导体及相关系统中自旋和电荷涨落的动力学

• 批准号: 9402923
• 负责人: George Reiter
• 金额: $ 1.51万
• 依托单位: University of Houston
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-11-01 至 1997-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9402923&HistoricalAwards=false
• 关键词: U.S.; Brazil; Science; Program; Dynamics

9402923 Reiter This U.S.-Brazil award will support a collaboration between Drs. George Reiter of the University of Houston, Houston, TX and F.C. Barreto of the Universidade Federal de Minas Gerais, Brazil. The goal of the project is to form an international collaboration between scientists experienced in the treatment of low-dimensional magnetic systems, and to resolve fundamental issues in the dynamics of spin and charge that have arisen in the study of high temperature superconductors. No generally accepted theory exists of the mechanism for superconductivity nor of the dynamics of the normal phase in the high Tc superconductors. Two key issues are whether or not the carriers in the materials can be described as a strongly correlated Fermi liquid, and whether or not the carriers would phase separate if not limited by the Coulomb interaction from doing so. There is no agreed upon answer to the first question. While the answer to the second question is yes, at some values of the parameters for the models that have been used to describe the Cu-O planes the situation remains unclear for the actual physical values. A treatment of the three band (Emery) model is proposed, which has the potential of answering both of the above questions. ***

小行星9402923 这个美国-巴西奖将支持休斯顿大学的乔治赖特博士和F.C.之间的合作。巴西米纳斯吉拉斯联邦大学的Barreto。 该项目的目标是在处理低维磁系统方面有经验的科学家之间建立国际合作，并解决高温超导体研究中出现的自旋和电荷动力学中的基本问题。 对于高温超导体的超导机制和正常相的动力学，目前还没有公认的理论。 两个关键问题是材料中的载流子是否可以被描述为强相关的费米液体，以及如果不受库仑相互作用的限制，载流子是否会相分离。对于第一个问题没有一致的答案。虽然第二个问题的答案是肯定的，但在用于描述Cu-O平面的模型的某些参数值下，实际物理值的情况仍然不清楚。 三带（金刚砂）模型的治疗提出，这有可能回答上述两个问题。 ***