A Study of the Thermal Vibration Anomaly of Cu in High Tc Superconductors near the Critical Temperature Using Positronand Electron Channeling and Neutron Absorption Spectroscopy

本项目将研究在高Tc超导体中铜原子振动运动中所表现出的异常现象，这些异常现象已在超导开始附近被检测到。目前尚不清楚这种异常是否与超导状态有关。实验将使用超导体中中子活化的Cu-64核发射的β粒子的阻断，中子吸收光谱和通道辐射光谱。这些测量将提供与超导特性相关的原子振动振幅的定量测量。这些实验将涉及与橡树岭国家实验室和丹麦奥胡斯大学的合作

This project will investigate the anomaly exhibited in the vibrational motion of copper atoms in high Tc superconductors that has been detected near the onset of the superconductivity. At present it is not known whether this anomaly is associated with the superconductive state. The experiments will use blocking of beta particles emitted from neutron activated Cu-64 nuclei in a superconductor, neutron absorption spectroscopy and channeling radiation spectroscopy. These measurements will provide a quantitative measure of the amplitude of the atomic vibrations that can be correlation with the superconducting properties. The experiments will involve collaborations with the Oak Ridge National Laboratory and with Aarhus University in Denmark