一、引言自从1986年由瑞士苏黎世IBM研究实验室的J.G.Bednorz和K.A.Muller发现在氧化物Ba-La-Cu-O系统中可能存在着超导转变起始温度为35K的超导电性,并很快为他们自己和日本东京大学的Shin-ichi USHIDA et a1.的抗磁性实验进一步证实后,在全世界范围内立即掀起了探索高临界温度超导体的热潮.在短短的半年多时间内,超导体研究领域中已经发生了革命性的变化.人们不仅发现了像Ba-La-Cu-O、Sr-La-Cu-O,以及Ba-Y- I. INTRODUCTION Since 1986, JGBednorz and KAMuller of the IBM Research Laboratory in Zurich, Switzerland have found that there may be a superconductivity of 35K in the oxide Ba-La-Cu-O system Faster testing of high-temperature superconductors around the world, soon after they were further substantiated by their own diamagnetic experiments with Shin-ichi USHIDA et al., Tokyo University, Japan In just more than half a year, superconductors Revolutionary changes have taken place in the field of research, not only people have discovered such as Ba-La-Cu-O, Sr-La-Cu-O, and Ba-Y-