Studies of High-Tc and Buckminsterfullerene Superconductors Under High Hydrostatic Pressure

这个项目将研究高温氧化物超导体中氧的有序性，以确定导致有序的基本结构和阳离子特征。温度相关的氧弛豫现象也将被详细研究。目的是建立这些现象和光致超导之间的联系。研究了K3C60和Ru3C60等富勒烯超导体中超导体转变温度和态电子密度的函数依赖关系。该项目将重点研究转变温度的压力依赖性以及泡利自旋磁化率。本项目致力于超导性的基础研究，然而，其结果可能在高tc和相关材料的压力效应背景下具有技术意义。在一个典型的高温超导体中，大约一半的组成原子是氧。这些原子，通过在晶格中的排列，敏感地影响材料成为超导体的温度。本项目致力于研究高tc材料晶格中的氧原子及其排列顺序。材料将作为温度和压力的函数来研究（这是高tc材料的重要热力学变量）。这些方法也将应用于另一种有趣的超导体材料：“富勒烯”，它含有钾或铷。这些实验探讨了材料的导电性能如何随温度和压力变化，将产生理论家们相当感兴趣的信息。这个项目是基础性的，但如果它能带来通往高温超导体的新途径，它可能具有技术相关性。＊＊＊

9509885 Schilling This project will search for oxygen ordering in High-Tc oxide superconductors in order to determine the essential structural and cation characteristics responsible for the ordering. Temperature dependent oxygen relaxation phenomena will also be examined in detail. An objective is to establish any link between these phenomena and photo-induced superconductivity. The functional dependence of the superconductor transition temperature and the electronic density of state in fullerene superconductors such as K3C60 and Ru3C60 will also be investigated. The project will focus on the pressure dependence of the transition temperatures as well as the Pauli spin susceptibility. This project is devoted to a fundamental study of superconductivity, however, the results may be of technical interest in the context of pressure effects on high-Tc and related materials. %%% In a typical high-temperature superconductor, approximately half of the constituent atoms are oxygen. These atoms, via there arrangement in the crystal lattice, sensitively influence the temperature at which a material becomes a superconductor. This project is devoted to the study of the oxygen atoms, and their ordering (arrangement) in the high-Tc materials lattice. The materials will be studied as a function of both temperature and pressure (these are important thermodynamic variables for the high-Tc materials). The methods will also be applied to another interesting superconductor material: "fullerenes", which contain potassium or rubidium. The experiments, which probe how the conducting properties of the materials vary with temperature and pressure, will yield information that will be of considerable interest to theorists. The project is of a fundamental nature, but may have technical relevance if it leads to new routes to higher temperature superconductors. ***