Study of Gap Anisotropy in High Tc Superconductors by Tunneling Method

本项目将使用低温扫描隧道显微镜对高tc材料进行研究。建立了一个超高真空系统，以研究超导表面角度的作用。通过这种方法，可以找出隧道电流的各向异性。这可能与高tc材料的电子态密度的各向异性有关，并为当前的高tc材料理论提供了输入和测试。测量将确定各向异性如何受到温度变化、散射过程和CuO2层之间耦合强度的影响。这个项目研究高温超导材料中电子的排列。高tc材料的特点是由铜原子和氧原子组成的平面。在这些CuO2平面内，电子电荷的排列是各向异性的，但直接测量各向异性是非常困难的。这个项目将使用隧道显微镜来探测不同角度表面的电子。由此产生的各向异性将用于测试当前的理论，并将提供有关高tc材料的重要基础信息。这些信息也与潜在的技术有关，因为超导器件可能取决于高tc材料的各向异性特性。＊＊＊

9307328 Ng This project will investigate high-Tc materials using low temperature scanning tunneling microscopy. A ultra-high-vacuum system has been built to allow a study of tunneling as a function of angle with respect to the superconductor surface. In this way the anisotropy in the tunneling current will be sought. This can be related to anisotropy in the density of electronic states of the high-Tc materials, and provides input to and tests of current theories of high-Tc materials. The measurements will determine how the anisotropy is influenced by temperature variation, scattering processes, and the coupling strength between CuO2 layers. %%% This project studies the arrangement of electrons in the high-Tc superconducting materials. The high-Tc materials are characterized by planes composed of copper and oxygen atoms. Within these CuO2 planes, the arrangement of electron charge is anisotropic, but direct measurements to determine the anisotropy are very difficult. This project will use tunneling microscopy to detect electrons having the surface at various angles. The resulting anisotropy will be used to test current theories and will provide important fundamental information about the high-Tc materials. The information is also relevant to potential technology in that superconducting devices may depend on the anisotropic properties of the high-Tc materials. ***