摘要
Since the discovery of A15 metallic superconductors, the possible mechanism responsible for the high transition temperatures has been a. central problem. The advent of high-T_c oxides such as Y-Ba-Cu-O, Bi-Sr-Ca-Cu-O and Tl-Ba-Ca-Cu-O has rendered this question even more interesting. In order to study the origin of superconductivity, it is useful to find
基金
This work was supported by the National Center for Research and Development on Superconductivity of China.
