高Tc超导GdBa_2Cu_3O_7薄膜弱连接双晶结研究

Investigation on High Tc Superconducting GdBa2Cu3O7-5Thin Film Week Link Bicrystal Junction

为了获得具有约瑟夫逊效应的超导弱连接结，我们在ＹＳＺ（钇稳定的氧化锆）双晶基片上，制备了高ＴｃＧｄＢａ２Ｃｕ３Ｏ７超导薄膜，晶界夹角为２４°和３２°两种，采用光刻技术的晶界上刻出不同尺寸的微桥，晶界贯穿桥区而形成双晶结，观测了结的直流１－Ｖ特性和在１０ＧＨｚ微波辐照下临界电流的压缩和Ｓｈａｐｉｒｏ台阶，实验结果证明双晶结具有约瑟夫逊弱连接行为，在实验基础上，对结的特性进行了理论分析，并将双晶结用于光探测获得成功。

ln order to obtain the superconducting weak link junction that has Josephson effect , The high Tc Superconducting GdBa2Cu3O thin film bicrystal junction have been fabricated on YSZ bicrystal substrates , the misorientation angle of bicrystal boundary are 24° and 32° respectivily. The samples were patterned using general photolith- graphy technique. The cryseal boundary pass through the centre of junction. The DC I - V charac- teristic and it under microwave irradiction of bicrys- tal junction were measured. The Josephson weak link characteristics were shown by experimental resultes of our bicrystal junction. On the base of experimen- tal the theoretical analysis were performed.