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

9402923 Reiter 该美国-巴西奖项将支持 Drs. 9402923 之间的合作。休斯顿大学（德克萨斯州休斯顿）和 F.C. 的 George Reiter巴西米纳斯吉拉斯联邦大学的巴雷托。 该项目的目标是在低维磁系统处理方面经验丰富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的基本问题。 关于超导机制和高温超导体中正相的动力学，不存在普遍接受的理论。 两个关键问题是材料中的载流子是否可以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，载流子是否会发生相分离。第一个问题没有达成一致的答案。虽然第二个问题的答案是肯定的，但在用于描述 Cu-O 平面的模型参数的某些值下，实际物理值的情况仍然不清楚。 提出了三带（Emery）模型的处理方法，它有可能回答上述两个问题。 ***

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. ***