中空円柱超伝導体における交流帯磁率特性(電気情報工学科)

Abstract

High-T_c ceramics are composed of two regions, grains and intergrains and their characteristics are determined by the combination of their properties. The main cause of the degradation of superconcucting characteristica originates in the intergrain among the superconducting grains. A quantitative analysis of the contribution due to the grain and link should be made to enhance the superconducting quality. The grained Bean model is proposed, where the superconducting phases acre immersed in the matrix link superconductor. This model gives a variety of complex AC susceptibility curves and a clear insight on the grain structures. By applying the model to AC susceptibility in a hollow cylinder, the effect of holes and vacancies in the superconductor will be discussed.