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Bednorz和Müller首次发现了La-Ba-Cu-O体系存在着超导性。不久,Chu等和赵忠贤等发现Y-Ba-Cu-O体系中存在着零电阻90K上下的超导体。随后,人们相继利用其它稀土替代La,Y。试图获得更高T_c的超导材料。实验表明,大部分其它稀土(如Nd,
Bednorz and Müller first discovered superconductivity in the La-Ba-Cu-O system. Shortly thereafter, Chu et al. And Zhao Zhongxian et al. Found that there is a superconductor above and below 90K in the Y-Ba-Cu-O system. Subsequently, people have to use other rare earth instead of La, Y. Attempts to obtain higher Tc superconducting materials. Experiments show that most of the other rare earths (such as Nd,