Studies of Ceramic Superconductors: Flux Flow and Chemical Doping

本文旨在研究陶瓷高温超导体(HTCS)中的两个重要问题。它们是磁通流动的动力学和化学掺杂的影响。我们将使用两种主要技术对这两个问题进行系统的研究。这些技术是直接磁通运动监测(DFMM)技术和X射线吸收精细结构(XAFS)技术。通过这两种技术的结合，这些结果有望提供有关磁通动力学和微观结构的信息，这将有助于清楚地理解和有效地控制高转变温度超导体的磁性和临界电流密度。这项实验研究旨在将磁通流动/磁通钉扎现象与其微观原因，即杂质联系起来。直接磁通运动监测(DFMM)技术和X射线吸收精细结构(XAFS)技术将用于本研究。这将对陶瓷高温超导体的磁性能和临界电流密度有一个清晰的认识和有效的控制。

This proposal aims to study two important problems in ceramic high Tc superconductor (HTCS). They are the dynamics of flux flow and effects of chemical doping. Two major techniques will be used to study both problems together in a systematic way. These techniques are the direct flux-motion monitoring (DFMM) technique and the x-ray absorption fine structure (XAFS) technique. by a combination of these two techniques, the results are expected to provide information on flux dynamics and microstructures which will be useful for a clear understanding and effective control of the magnetic properties as well as critical current density of the high transition temperature superconductors. %%% This experimental study aims to connect the phenomena of flux flow/flux pinning with their microscopic causes, namely, the impurities. Both the direct flux-motion monitoring (DFMM) technique and the x-ray absorption fine structure (XAFS) technique will be used in combination for this study. It will provide a clear understanding and effective control the magnetic properties and critical current density of the ceramic high transition temperature superconductors.